Homeostatic mechanisms :

a. keep variables exactly at the set point.
b. act to keep values out of the normal range.
c. help to keep a relatively constant internal environment in the body.
d. usually operate by positive feedback.
e. produce most disease conditions.

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

In a cladogram' when does a group of organisms branch off

In order to study genetic mutations, scientists must study genetic material. which statement describes the genetic material scientists are most likely studying? a) they study alleles that contain chromosomes, which are rna.b) they study alleles that contain genes, which are chromosomes.c) they study chromosomes that contain genes, which are dna segments.