An example of a single hormone that can exert effects in different tissues is erythropoietin. erythropoietin is made in the kidney and stimulates the bone marrow to produce: 1. platelets.
2. natural killer cells.
3. red blood cells.
4. mast cells.

Red blood cells (Ans. 3)

Explanation:

Erythropoietin or EPO is a hormone which is also called as haemopoietin, it is a glycoprotein cytokine. One unique characteristic of hormones is that single hormone helps to apply various effects in different tissues.

For example erythropoietin which is known as traditional circulating hormone is made in the kidney, on the other hand at the same time it produces red blood cells (erythropoiesis) in the bone marrow.

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.