Female sharks can store sperm after mating and then wait to fertilize their eggs. Scientists investigated whether the female shark in the zoo did this.
C
Describe how DNA analysis can determine if the shark reproduced using stored sperm or if she
reproduced asexually. Be sure to include the source(s) of DNA being analyzed and the results of
the analysis in your answer.
d. Explain why sexual reproduction is important for the long-term survival of shark species.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.