Which was charles darwin’s contribution to the study of biology?
a.) he was the first person to recognize that organisms change over time.
b.) he believed that organisms adapted through the inheritance of acquired traits.
c.) he explained how traits are passed from parents to offspring.
d.) he proposed that natural selection is the primary mechanism of evolution.

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

Water changes bacteria in the soil converts this nutrient into a usable form. plants take up the usable nutrient through the soil and assimilate it into proteins, making it part of the plant. an animal eats the plants, and the nutrient becomes part of the animal. when the animal dies, it decomposes, returning the nutrient back to the soil. which cycle is being described? water cycle carbon cycle nitrogen cycle phosphorous cycle

Acharacteristic controlled one or more genes is called a