The gametophyte of a liverwort produces sperm in a structure called a(n)
a. sorus.
b. sporangium.
c. archegonium.
d. antheridium.

In general in which direction does wind blow

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

In the practice of science, this type of reasoning is used to develop explanations.