Bacteriophages are viruses that attack and destory

Bacteria

Explanation:

They are harmless to humans but murder billions and billions of bacteria everyday! There's also 10^31 bacteriophages on Earth, more than every other organism on Earth, including bacteria, combined so they are pretty abundant killers of bacteria.

you are the source of the heat energy. you can minimize the heat energy by selecting the appropriate clothes to wear.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )