2019 years have humans been on earth
It sends an impulse back to the cell body of a neuron
Answer:
B is the answer I guess for the question
Permitting the exchange of nutrients and gases between the blood and tissue cells is the primary function of capillaries. Capillaries are the smallest blood vessels , they are only one cell thick, and they act as sites of the transfer of oxygen and other nutrients from the bloodstream to the body tissues. Additionally, they also collect carbon dioxide, waste materials and fluids for return to the veins.
Explanation:
seeds are the prime stage of a plant to it's development journey .
It's main function is the development and nourishment of embryo.
there is food already received in seed.
in the stage of development it provides with amount of water and help in development...
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