An earthworm lives and reproduces in the soll. Through its feeding, excretion and tunneling activities, the worm adds nutrients and allows air to enter the soil.
Together, these statements describe the earthworm's *
a. Habitat
b. Nutrition
c. Environment
d. Niche

the answer to your question is sperm

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

d. planting trees

the trees take in carbon to make oxygen.