An obstruction in the afferent arteriole would reduce the flow of blood into thea. glomerulus. b. renal artery. c. macula densa. d. efferent arteriole. e. arcuate artery.

a. glomerulus

Explanation:

Afferent arterioles are the blood vessels that bring the blood to the nephrones of the kidneys. They branch into the capillaries of the glomerulus, the beginning of the nephron.

Afferent arterioles are responsible for the regulation of the blood pressure via  tubuloglomerular feedback mechanism.

When blood flow is reduced:

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.