What are the 2 main ideas behind natural selection? (will give brainlist!)

1-Charles Darwin

2-Alfred Russel Wallace

Explanation:

are jointly credited with coming up with the theory of evolution by natural selection, having co-published on it in 1858. Darwin has generally overshadowed Wallace since the publication of On the Origin of Species in 1859, however.

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.

this would be called the responsiveness