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ad-work [718]
3 years ago
7

What anatomical feature of the veins maintains a unidirectional flow of blood back toward the heart?

Biology
1 answer:
Reika [66]3 years ago
3 0
One way valves maintain the unidirectional flow.
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To classify an organism as an invasive species all of the following characteristics must be met EXCEPT:
Sphinxa [80]

Answer:

Must be spread through human actions alone

Explanation:

Cause it's the only one that isn't true.

5 0
3 years ago
The PCR technique requires a DNA polymerase from an organism that can endure high heat, such as Thermus aquaticus. What step of
DENIUS [597]

Answer:

Extension

Explanation:

Polymerase chain reaction is given by Kary Mullis and it contains three steps denaturation, annealing, and extension. In denaturation, the temperature is raised to 96° c so that the DNA can denature.

In annealing, the temperature gets reduced to 55°c so that the primer can bind to the complementary sequence. In extension, Taq polymerase is used to extend the new strand.  

This enzyme is isolated from thermophilic bacteria and the temperature here is raised to 72°c so that the enzyme can extend the primer and make the complementary strand. So the right answer is extension.

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3 years ago
Why dont two species occupy the exact same ecologial niche?
frez [133]
Because they would need to compete over resources.
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What is the difference between phototropism and tropism ?
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Facilitates the roots of plants going down towards gravity and the stems to rise up away from gravity. ... Thus, the difference is that geotropism is driven by gravity and phototropism is driven by light.
6 0
3 years ago
Read 2 more answers
Type the answer through sentences please and thank you
Nonamiya [84]

In order for plants to make their own food, they must go through a process called photosynthesis. This process occurs in the chloroplasts of a cell. To begin this process, all items needed must go to the cells of a plant. Water and nutrient are absorbed from the soil through the roots. A tube called the xylem carries only water up the stem to the rest of the plant. Gas exchange in the plants occur in the tiny pores of a leaf called the stomata. This is opened and closed by the guard cells. The food produced by this process is called ATP and it is a macromolecule known as a nucleic acid.

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3 years ago
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