How fast is the us population growing? a. 13 births per day. b. 35 births per day. c. 13 births per 1000 people. d. 35 births per 1000 people.

Option C, 13 births per 1000 people

Explanation:

The number of children born in 2015 in USA is 3,978,497 which is approximately 4 million in number.

Considering the population of USA in 2015  which was 32.1 crore, the number of birth per 1000 person in the country is worked out to be 13 per 1000 people.

However, this mark has not yet increased after 2015. hence, it can be said that there are 13 babies taking birth in every 1000 people.

Hence, option C is correct.

d. in sexual reproduction, offspring have more chromosomes than

either parent.

asexual reproduction results in offspring which are genetically the same as the parent organism (not counting a rare mutation). sexual reproduction produces a random mixture of the genetics derived from both parents

explanation:

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.