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jeka57 [31]
3 years ago
15

How do veins return blood to the heart? select all that apply?

Biology
1 answer:
Jobisdone [24]3 years ago
6 0
A relatively small blood pressure gradient is generally insufficient to move blood through the veins under given conditions, thus venous return must be facilitated by valves within veins and two "pumps." ... As skeletal muscles contract, veins are squeezed to help propel the blood toward the heart.
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What would happen if spindle fibers weren't present in plant cell mitosis?
Taya2010 [7]

Mitotic spindles are microtubule-based structures that separate chromosomes during mitosis. So the cell would lack structure.


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3 years ago
A client with fibromyalgia has not achieved pain relief with opioid pain medication. the client has a history of diabetes mellit
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8 0
3 years ago
What facts can you compile that would support a theory that multicellular eukaryotes developed from unicellular prokaryotes?
Delicious77 [7]

Answer:

Multicellular eukaryotes evolved from unicellular prokaryotes by the process of endosymbiosis

Explanation:

All living beings have evolved from three groups of animals closely related with each other.Domains: Archaea,bacteria and eukarya.the archaea and bacteria are unicellular organism surrounded by single cell water and  and coiled stand of DNA. Eukaryotic cells are more complex and with a linear  strand of DNA which is in the nucleus. Actually mitochondria which had evolved from a free living bacterium which was swallowed by another cell. The host cell benefited from the chemical energy that mitochondria produced and mitochondria in turn is benefited to be inside the protected environment. Mitochondria is the main organelle which the multicellular eukaryotes with unicellular prokaryotes.

3 0
3 years ago
In diffusion and osmosis what happens to the concentration of water inside each cell
avanturin [10]

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6 0
3 years ago
Which statements correct
sladkih [1.3K]
The correct answer is C. Here's why: 

Choice A is illogical. A single experiment does not confirm a theory as true. Multiple successful trials are needed for one to even consider a hypothesis to be accepted as a theory. 

Choice B is wrong. If a scientist finds a new way to test a hypothesis, experimental methods do change. Note that when there are additional ways to test a hypothesis, a scientist should test it with additional methods. 

Choice D is incorrect. If someone finds a way to test a new hypothesis, it would not be made into law since there is more information regarding the theory. This means that it would remain a theory until one can prove that it can't be tested using different methods.
3 0
3 years ago
Read 2 more answers
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