Which of the following are main tenets of Darwin's theory of natural selection?

Individuals most adapted to their environments have a better chance of surviving to reproduce.
Individuals can produce more offspring than can survive.
Individuals compete for resources.
The traits within a population vary and are heritable.
Traits acquired during an individual's lifetime are heritable.

(i) Individuals most adapted to their environments have a better chance of surviving to reproduce.

(ii) Individuals compete for resources.

(iii) The traits within a population vary and are heritable.

Explanation:

Adaptation was an important aspect of Darwin's theory, so the first statement must be true. The traits within a population vary which leads to natural selection, so the second-last statement is also true. Resources are limited and therefore, competition is abundant, and this, the 3rd option is also true.

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b

not sure if this is what you'r looking for nnew= nold