Which of the following are NOT correct based on Darwin's theory of evolution?

a
some populations tend to overpopulate
b
resources can limit population growth
c
some individuals are better suited to success in the environment
d
variations in individuals are not heritable

D: Variations in individuals are not heritable

Explanation:

Variations of animals, if there not primarily aesthetic, are actually useful animals to survive in their environment. Some populations do overpopulate, some resources (e.g. to water in an environment, which can flood said environment.) can stunt population growth, and some individuals are better suited to success in their given locations, in which there genes are passed down to their offspring. Those were all true, but D doesn't make any sense because those variations allow for them to survive if they benefit an individual

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.