5. The structures labeled B in the picture above are called... a. centromeres
b. centrioles
c. sister chromatids
d. spindles

6. The structurc labeled A in the same diagram above as in question 5 is called the...
a. centromere
b. centriole
c. sister chromatid
d. spindle

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.

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

Talking listening and reacting non verbally are all part of communicating