2. Which of the following is a way in which the skin helps maintain homeostasis?
A. by regulating body temperature
B. by protecting the body from antigens
C. by excreting waste products
D. all of these
3. Which structure within the skin excretes organic substances such as?
a sebaceous gland
a hair follicle
a sweat gland
a cuticle
4. Which two body systems work together with temperature receptors in the skin to produce shiverin
in response to cold?
nervous and muscular
B.
muscular and digestive
nervous and endocrine
skeletal and circulatory

Which pattern most likely came from a gunshot and which one was produced from a blow on the head? explain your answer?

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards.the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote