PLSS HELP ME The health of some organisms is helped by certain microorganisms when these microorganisms -
A. assist in the breakdown food and produce vitamins.
B. cause disease by releasing toxins and killing host cells.
C. infect the leaves and roots of trees in an ecosystem.
D. reduce available oxygen in aquatic ecosystems.

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Most of the carbon on earth is stored in the form of

If the rna molecule in a human has the nucleotide sequence of guu, this would the amino acid valine would be needed to make the protein. how would this cha process was occurring in a mushroom?