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QveST [7]
4 years ago
10

Some animals have no gills when young, but then develop gills that grow larger as the animal grows larger. what is the reason fo

r this increase in gill size?
Biology
1 answer:
In-s [12.5K]4 years ago
6 0
Young animals are very small, the oxygen easily diffuse inside their bodies, plus due to the small size they need little amount of oxygen to maintain body functioning. Larger animals need more oxygen to live and simple diffusion is no longer sufficient. Gills extend body surface in highly vesseled regions and that makes the diffusion a lot more efficient.
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What step would you likely find in the life cycle of an animal virus, but not in a bacteriophage
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Explanation:

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What is true of saturated fatty acids?
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3 0
3 years ago
Read 2 more answers
The virulent form of the bacteria S. pneumoniae is called the S strain because it is surrounded by a polysaccharide coat that ma
Aleksandr-060686 [28]

Answer:

1. living s strain= mice dies

2. heat killed s strain= mice live

3. living r strain= mice live

4. heat killed s strain + living r strain= mice die

Explanation:

Options

1. living s strain

2. heat killed s strain

3. living r strain

4. heat killed s strain + living r strain

Solution

It is known that S strain of the pneumococcal bacteria has virulent properties and hence it can kill an organism but when this S strain is heated its virulent factor dies and it becomes ineffective. R strain on the other hand does not possess virulent characteristics and hence it does not affect the mice. If R virulent is mixed with heat killed S strain, the new  strain is  transformed virulent strain which could kill an organism.

Considering above description, the answer would be  

1. living s strain= mice dies

2. heat killed s strain= mice live

3. living r strain= mice live

4. heat killed s strain + living r strain= mice die

6 0
3 years ago
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