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s344n2d4d5 [400]
2 years ago
8

what system is responsible for the exchange of oxygen and carbon dioxide between the air and the cells?

Biology
1 answer:
spayn [35]2 years ago
4 0

Answer:

What Are the Lungs and Respiratory System? The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.

Explanation:

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He is credited with the discovery of Nucleic Acids.
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Why is it easy for a virus to mutate?
drek231 [11]

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Viruses mutate very quickly The major reason that viruses evolve faster than say, mosquitoes or snakes or bed bugs, is because they multiply faster than other organisms. And that means every new individual is an opportunity for new mutations as they make a copy of their genetic material. Many of those mutations have no noticeable effect.

Explanation:

6 0
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Which of these describes a situation where natural selection could lead to evolution?
Gennadij [26K]

Answer:

B. Predation removes slower antelope from the herd.

Explanation:

Natural selection is defined as the differential survival and reproduction of individuals due to differences in the physical characteristics.

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5 0
3 years ago
Compare and contrast the de novo synthesis of purine and pyrimidine ribonucleotides. move each item to the appropriate bin. if a
Arisa [49]
<h3><u>Answer and Explanation</u>;</h3>
  • Purines: Heterocyclic rings are synthesized one atom at a time, first atom attached to ribose phosphate (source is PRPP) and then all the other atoms are added .
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8 0
3 years ago
During infection, C. diphtheriae expresses a variety of genes that are used to establish infection and cause disease. One of the
galina1969 [7]

Answer:

B. AUU CGC AUC UUG AAC

Explanation:

<em>According to the rule of base pairing in DNA, the pyrimidine bases always pair with purine bases. Specifically, adenine (A) always pair with thymine (T) while Guanine (G) always pair with cytosine (C). In RNA, thymine is replaced by uracil (U).</em>

Hence, TAA GCG TAG AAC TTG  will give

             AUU CGC AUC UUG AAC.

The correct option is B.

3 0
3 years ago
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