BIOLOGY HIGH SCHOOL

What should the students do to model convalent bonding between two chlorine atoms?

Answers

Answer 1
Answer: Draw a single covalent bond between the 2 chlorine atoms, and place 3 lone electron pairs surrounding each of the chlorine atoms. This chemical bond is a Nonpolar one, as both chlorines have equal electronegativities.

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HIGH SCHOOL

What is the difference between a simple sugar and a complex carbohydrate? Give an example of each.

Answers

Simple carbohydrates provide energy but for only a short time.

EXAMPLES: foods: fructose – sugar in fruits; lactose – sugar in milk; Sucrose – table sugar.

Complex carbohydrates provide energy for a longer amount of time.

EXAMPLE FOODS: Wheat pastas, brown rice, whole grain breads, cereals.

Simple carbohydrates are called simple sugars. Sugars are found in a variety of natural food sources including fruit, vegetables and milk, and give food a sweet taste. But they also raise blood glucose levels quickly.
Sugars can be categorised as single sugars (monosaccharides), which include glucose, fructose and galactose, or double sugars (disaccharides), which include sucrose (table sugar), lactose and maltose.

Complex carbohydrates, also known as polysaccharides, are starches formed by longer saccharide chains, which means they take longer to break down.
Chemically, they usually comprise of three or more linked sugars.
Strictly speaking, the term complex carbohydrate refers to any starches, including the highly refined starches found in:
White bread
Cakes
Most pastries and
Many other food sources
When dietitians and nutritionists advise having complex carbohydrates, however, they are usually referring to whole grain foods and starchy vegetables which are more slowly absorbed than refined carbohydrate.
HIGH SCHOOL

Water can "defy gravity" and climb uphill? True or false. Why or why not

Answers

The answer is actually true.

The starting point of all rivers is higher than their end point. However, under the right conditions, small amounts of water can be drawn upwards, against the tug of gravity, through a phenomenon known as "capillary action". For this to occur, however, the water must be confined into a small flow space.

Hope this helps!  If it does, would you mind marking my answer as Brainliest? Thanks :D

MIDDLE SCHOOL

The theory suggests that for every big bang there is a big church oscillating universe theory

inflation theory

steady state theory


big bang theory

Answers

The theory that proposes that the universe emerged form an explosion (The Big Bang) is known as the Big Bang Theory.


Hope it helped,


BioTeacher101

MIDDLE SCHOOL

Why would farmers want to farm near rivers even with the potential of the river flooding???????????

Answers

Answer:

The answer is to increase crop growth.

Explanation:

Farmers construct a man made channel leading water from the river to their crops. When farming near rivers the soil is good enough for planting. Many bugs animals poop their which help grow the plants and they are watered daily. After you plant the crops you are basically done. And the River is a Natural source of water so their are no worries of daily watering because nature is doing it for you. Even tho flooding can happen they have sand bags and walls that they set up to control this.

MIDDLE SCHOOL

True or false Folded rocks were produced by isostasy.

Answers

I believe that its False, but don't hold me to that
MIDDLE SCHOOL

The pictures below show the bone structures of three different animals. The similarity in structure of the bones of these animals suggest:

Group of answer choices

the size of the bones is the same

these species share a common ancestor

these species developed at the same time and location

The chemical makeup of these animals is exactly the same

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Question 26.6 pts
Which of the following is NOT true about natural selection?
Group of answer choices

It results in adaptations that improve an organism's chance of survival

It ensures that only the biggest and strongest organisms survive

It depends on both inheritance and variation

It explains how environments affect which organisms live and reproduce

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Question 36.7 pts
A structure that seems to serve no purpose in an organism is called:
Group of answer choices

homologous

dichotomous

vestigial

fossilized

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Question 46.7 pts
A population of bacteria is treated with hand sanitizer. Because of genetic variation in the population, what is the possible outcome?
Group of answer choices

There will be no change in the bacteria.

Some of the bacteria may be resistant and survive.

The population will grow quickly

All of the bacteria will double in size

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Question 56.6 pts
Which of the following does NOT increase genetic variation?
Group of answer choices

Mutations

Gene flow

Mitosis

Crossing over

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Question 66.7 pts
Which of the following is NOT an example of evolution?
Group of answer choices

A caterpillar changing into a butterfly

Horses becoming taller and faster over millions of years

Humans brains becoming larger over time

All species of tortoises in the Galapagos islands descending from a common ancestor.

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Question 76.6 pts
A feature that allows an organism to better survive in its environment is a(n):
Group of answer choices

variation

adaptation

DNA molecule

fitness

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Question 86.7 pts
Genes for traits that help an organism be more reproductively successful can be expected to:
Group of answer choices

cause it to evolve into a new species

eventually be eliminated by natural selection

become more common in the future

cause the extinction of the species

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Question 96.7 pts
Scientists can explore whether two different animal species have evolved from a common ancestor, using evidence from all of the sources below except:
Group of answer choices

analysis of strands of DNA

studies of embryos during development

comparison of bones and muscles

comparison of experiences from each organism

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Question 106.7 pts
How can geography lead to reproductive isolation?
Group of answer choices

Subspecies may choose to occupy different areas for competitive reasons

A physical barrier may arise and separate a population, preventing interbreeding

Some populations may have a milder habitat than other populations

Extremes of temperatures may reduce the breeding opportunities for some

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Question 116.6 pts
Which of these scenarios is an example of natural selection?
Group of answer choices

People kill rattlesnakes that rattle when approached by humans, but people do not kill rattlesnakes that remain silent. The quiet snakes survive and breed

Dogs that have a desirable coat color are bred with one another to produce puppies with the same coat color

Giraffes that have longer necks survive a dry season by eating leaves from the tops of trees. Those giraffes breed more successfully that year

Farmers crossbreed two types of cows to produce a breed of cow that has high quality beef and can tolerate a hot climate

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Question 126.6 pts
The combination of all the genes in a breeding population are referred to as:
Group of answer choices

chromosomes

individuals

gene flow

gene pool

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Question 136.7 pts
How do mutations influence evolution?
Group of answer choices

A heritable characteristic that increases an organisms chance at surviving and reproducing in its given environment

The mutation causes more awareness and intelligence so that the organism can out compete others

A change in the DNA produces a variation within the gene

Creates a new body part or structure that allows for a better chance at survival

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Question 146.7 pts
What is the best description for evolution?
Group of answer choices

A change in a population over time

A change in an organism over time

The variation of species globally

The diversity between us and other living things

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Question 156.7 pts
In order for a species to evolve, it must be able to:
Group of answer choices

be domesticated

consume a large quantity of food

reproduce successfully

maintain a constant body temperature

Answers

Answers:

1. ) B- these species share a common ancestor

2. ) B- it ensures that only the biggest and strongest organisms survive

3. ) C- vestigial

4. ) B- some of the bacteria may be resistant and survive

5. ) C- mitosis

6. ) A- a caterpillar changing into a butterfly

7. ) B- adaptation

8. ) C- become more common in the future

9. ) D- comparison of experiences from each organism

10. ) B- a physical barrier may arise and separate a population, preventing interbreeding

11. ) C- giraffes that have longer necks survive a dry season by eating leaves from the tops of trees. Those giraffes breed more successfully that year

12. ) D- gene pool

13. ) C- a change in the DNA produces a variation within the gene

14. ) A- a change in a population over time

15. ) C- reproduce successfully

Explanation:

I just took the test and got a 100%

Answer:

this is to long! can u give me a outline of the question and ill give you the answers then

HIGH SCHOOL

`1 what happens when an action potential reaches the end of the axon A the potassium ions travel back towards the cell body
B the neuron takes up chemical messengers (neurotransmitters)
C the sodium ions travel back towards the dendrites
D the neuron releases chemical messengers (neurotransmitters)

Answers

D. The neuron releases chemical messengers (neurotransmitters).
HIGH SCHOOL

To increase chances for a successful organ transplant, the person receiving the organ should be given special medications. the purpose of these medications is to

Answers

To increase chances for a successful organ transplant, the person receiving the organ should be given special medications. The purpose of these medications is to reduce the strength of the body’s immune system in order to create a balance between providing enough immunosuppression to avoid rejection and to also minimize side effects after the organ transplant.






MIDDLE SCHOOL

Which of these physical factors most shapes the characteristics of a ecosystem? A)soil type
B)Longitude
C)temperature and rainfall
D)air circulation patterns

Answers

Answer:

most likely C,

Explanation:

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