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krek1111 [17]
3 years ago
14

Please help me its due in 20 minutes

Biology
2 answers:
Tpy6a [65]3 years ago
5 0
D arteries carry blood back to the heart
Ratling [72]3 years ago
3 0

Answer:

D

Explanation:

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What is the watery substance that makes up the cytoplasm
SOVA2 [1]

Answer:

cytosol

Explanation:

hope this helps

5 0
3 years ago
Explain how seasonal fires benefit grassland ecosystems.
Soloha48 [4]

Answer:

Without fires, there would be no life on Earth . Fires are key to maintaining the proper oxygen concentration in the atmosphere; fire regulates the carbon cycle and life, as we know it, is based precisely on carbon

Explanation:

Although we tend to think of fires as a human invention that kills plants, animals, people, fire, as with rain or wind, is an essential natural component, basic to maintain the planet's biodiversity.

As for example, grassland ecosystems are also benefited by the same fires that allow renewal, and generate natural sustainability on the earth through the carbon cycle.

3 0
3 years ago
Keystone predators can maintain species diversity in a community if they _________. A. competitively exclude other predators B.
Alisiya [41]

Keystone predators can maintain species diversity in a community if they  prey on the community's dominant species

Option B is correct.

What is meant by keystone predator?

A keystone species is usually a dominant predator whose removal allows a prey population to explode and often decreases overall diversity. other forms of keystone species are those, like coral or beavers, that significantly alter the habitat around them and thus affect large numbers of other organisms.

Are keystone species always predators?

A keystone species is usually , but not always, a predator. Just some predators can control the distribution and population of large numbers of prey species. the whole concept of keystone species was founded on research surrounding the influence of a marine predator on its environment.

Learn more about keystone predators:

brainly.com/question/506554

#SPJ4

8 0
2 years ago
How are ocean ridges and trenches related? Describe their relationship in
True [87]

Terms that are asked to be used in the response are bolded;

     Ocean ridges and trenches are related in a few ways. One of the ways is being created from the movement of tectonic plates on the mantle when they diverge and converge. When tectonic plates diverge they "pull apart" and create trenches. When they converge they "push together" and create ridges, subduction happens here. The tectonic plates move on the mantle of magna from convection currents creating these different boundaries.

Have a nice day!

<em>Note: Please keep in mind that if you would like to use my work you must reword it or give a proper citation, thanks.</em>

     I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly.

- Heather

8 0
2 years ago
A sound wave with a frequency of 300 hertz is traveling through a medium at a speed of 320 meters/seconds. What is it’s waveleng
dalvyx [7]

1. The wavelength is the ratio of the wave's speed to its frequency in hertz or 1/s. This is shown below,
                           λ = s / f = (320 m/s)  / (300 1/s) = 1.07 m
The wavelength is approximately 1.07 m.

2. The frequency is the ratio between speed and the wavelength,
                        f = (330 m/s) / 0.45 m = 733.33 hertz

Read more on Brainly.com - brainly.com/question/1553993#readmore
5 0
3 years ago
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