Which of these best describes a hormone? O A. A chemical message with a specific target
O B. An enzyme delivered to a specific gland
O C. Any message carried by the bloodstream
D. A steroid carrying a message to a receptor cell

A. A chemical message with a specific target.

Explanation:

Hormone is a chemical that is secreted by the body to perform a particular function.

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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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ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).