Answer:
Option (A)
Explanation:
Convergent evolution may be defined as the independent evolution of similar features in different species. This evolution shows analogous structure that perform similar function but do not have a common ancestor.
Penguins, sea turtles and manatees forelimb is an example of convergent evolution because similar forelimb structure evolution has occurred in different species lineage. The convergent evolution of forelimb structure in these species permit movement in water.
Thus, the correct answer is option (A).
Answer:
destruction of infected cells by cytotoxic T cells, or the destruction of intracellular pathogens by macrophage
Explanation:
A cell-mediated immune response is an immune response that does not involve antibodies. Cell-mediated immune responses involve the destruction of infected cells by cytotoxic T cells, or the destruction of pathogens by macrophages.
The answer cannot be either of the options involving B cells, as these are involved in the antibody response. The cytotoxic T cells are what actually destroy the infected cells (not helper T cells). Therefore, the answer is destruction of infected cells by cytotoxic T cells, or the destruction of intracellular pathogens by macrophage
Answer:
Nitrogenous base
Explanation:
Adenine, thymine, guanine, cytosine
Answer:
lateral; inferior
Explanation:
In anatomical terms:
- Superior is towards the head, and <u>inferior </u>is towards the feet.
- Medial is towards the centre of the body (belly button) whereas <u>lateral </u>is towards the outside of the body (towards the hip bones and arms, for example)
- Posterior is towards the back (spine), whereas anterior is towards the front (belly)
Therefore, the fingers are lateral (to the side) and inferior (lower) than the heart
