Which of the following is NOT one of Darwin's 4 points of natural selection? A) There is variation within a population.

B) There are traits that occur due to mutations.

C) There are more offspring produced than can survive.

D) The ones that survive have the favorable trait(s).

d is the answer

they deliver oxygen to the blood

common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.