In vertebrates, chemical messengers called hormones are secreted by the system. endocrine excretory hormonal pituitary

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

Ry was studying two populations of the same species of lizards. one population lived on an island and the other lived on the mainland. both populations were affected by a hurricane that hit the island and the mainland with equal force. a year later, henry was testing the gene frequency and saw a decrease in genetic variation in the island species, but not in the mainland species. which best describes a conclusion he might have reached? gene flow greatly affects small populations, but large populations can recover. genetic drift greatly affects small populations, but large populations can recover. gene flow greatly affects large populations, but small populations can recover. genetic drift greatly affects large populations, but small populations can recover.

Study this image which statement best describes the rock shown check all that apply