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ratelena [41]
3 years ago
9

A type of organism that no longer exist on earth is said to be

Biology
2 answers:
11111nata11111 [884]3 years ago
7 0

extinct organisms; that is, they belong to species that are no longer living anywhere on Earth. (3) The kinds of fossils found in rocks of different ages differ because life on Earth has changed through time.

kati45 [8]3 years ago
3 0

They are considered to be extinct

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Buffer?
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3 years ago
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What law best explains why an organism with Tt will show only the dominant phenotype
nirvana33 [79]

This is the law of dominance in genetics. The dominant allele will mask the effects of the recessive allele and therefore will be the visible trait of the phenotype. Most often, the dominant allele codes for functional proteins, while the recessive does not code for functional proteins. Dominance in genetics is significant in Mendelian inheritance.  






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3 years ago
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What are the reasons for the several day delay in a primary response. Infection______. A. transport to secondary lymphoid tissue
Liula [17]

Answer:

The correct answer is D. proliferation and differentiation.

Explanation:

Primary immune response occurs due to the first exposure of an antigen to the immune system. The primary immune response is generally delayed by many days because it takes time for B and T cells to become cloned and to proliferate and differentiate.

Then after several days of proliferation and differentiation of activated T and B cells, T cells become effector T cells and B cell becomes plasma cells which then eliminates the antigen. Memory B and T cells are also produced during this process which helps in generating a quick immune response during the second and subsequent exposure of that antigen.

So the correct answer is D. proliferation and differentiation.

7 0
3 years ago
All cells contain a special molecule called
Travka [436]

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3 0
3 years ago
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just olya [345]

The correct answer is option D. copper (Cu)

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Malleability of a metal is closely related to its density. The denser the metal, the less easily malleable it is.

Both copper and strontium are metals but copper is denser than strontium hence copper is less malleable than strontium.

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