Which of the following scenarios is representative of mutualism?
a.
barnacles living on whales
b.
bees pollinating flowers
c.
birds feeding on insects stirred up by grazing animals
d.
mosses living on tree trunks

The instructions for the genetic traits of an organism are directly determined by the a-numbers of a,t,c and g units in a sugar molecule b-sequence of the bases in dna molecules c-length of a dna molecules d-way the bases are paired in the two strands of a dna molecule

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Astudent conducts an experiment to determine how the amount of water given to a plant affects it growth what is the dependent variable for this experiment