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svp [43]
2 years ago
14

How do nitrate levels affect the health of a water system?

Biology
1 answer:
Shkiper50 [21]2 years ago
8 0
It doesn’t have a effect on aquatic insects or fish. But it can create conditions that make aquatic insects/fish difficult for them to survive.
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When we say an animal has an "open circulatory system," this means that: movement of the animal is solely responsible for moving
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An open circulatory system simply means that the blood flows out of vessels and into the spaces or sinuses. Invertebrates, insects and crustaceans has an open circulatory system where pump blood goes into a hemocoel and diffusing back to the circulatory system between cells. In other animals, the heart pumps the blood into the body cavities, spaces or sinuses, where the blood surrounds the tissues.  
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3 years ago
A gene is a region of DNA that contains instructions for the manufacture of?
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Either amino acids or genotypes.
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Suppose one parent is heterozygous for a dominant disorder and the other parent is homozygous normal. Draw a pedigree showing th
Radda [10]

There is only two possible offspring.

Bb and bb

Homo is the same

Hetero is different

            b               b

B     <u> Bb </u>              <u> Bb</u>

   

b       <u> bb  </u>               <u> bb </u>

                             

3 0
3 years ago
What would happen to<br> offspring if crossing over did<br> not occur?
Dovator [93]

Answer: If crossing over did not occur during meiosis, there would be less genetic variation within a species. ... Also the species could die out due to disease and any immunity gained will die with the individual. Two types of gametes are possible when following genes on the same chromosomes. If crossing over does not occur, the products are parental gametes. If crossing over occurs, the products are recombinant gametes.

Explanation:

6 0
3 years ago
Why are vestigial structures are considered examples of<br>homologous structures?​
Vera_Pavlovna [14]
Vestigial structures are often homologous to structures that are functioning normally in other species. Therefore, vestigial structures can be considered the evidence for evolution, the process by which beneficial heritable traits arise in populations over an extended period of time.
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