How do jellyfish move?
with a hydroskeleton
with an exoskeleton
with an endoskeleton
with a circular muscle and the water from the environment

Barbara is converting 78°f to degrees celsius. first, she subtracts 32 from 78. what is the next step?

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.

Physical characteristics of down syndrome