Ablood vessel one cell thick for absorption of nutrients and removal of wastes is
a. a vein.
b. an artery.
c. a capillary.
d. the pulmonary artery.

What are some characteristics of a free enterprise economy?

What is one reason why transpiration is important in plants? question 19 options: it produces food from the sugar in the plant cells. it enables the flow of water out of the plant. it produces carbon dioxide in the leaves of the plant.

What happens to the amount of waste in the pond as the ecosystem ages?