Which of the following is true about Depo-Provera (DMPA)?

A. It works by stopping ovulation and thickening the cervical mucus.
B. It is used to prevent pregnancy for a period of 24 weeks.
C. It is a good birth control method for those desiring an immediate pregnancy.
D. It regularizes menstrual cycles and controls irregular bleeding.

Option A.

It works by stopping ovulation and thickening the cervical mucus.

Explanation:

Depo provera (medroxyprogesterone acetate) is a contraceptive injection that contain the hormones progestin which is used as a birth control. It stops the woman from getting pregnant by stopping ovulation and causing thickening of cervical mucus. It is an injection given every three months, it is safe and convinient for birth control.

It has some disadvantages and these include, it can cause irregular periods, it does not prevent against sexually transmitted disease, it should be stop several months before you can get pregnant e.t.c.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.