ANSWER 1,3,4 CITE SOURCES… post link to website? if its from book say what book and type that sentence that supports your answer or if you know it for sure EXPLAIN IT?? try to support your answer! cuz we haven’t covered those materials yet so ya…. thanks!!!

1. The major difference between cartilage and bone is that cartilage
a. is a part of the skeletal system
b. is composed of collagen and salts
c. lacks blood vessels and nerves
d. secretes a rubbery matrix
e. is a type of connective tissue

2. All of the following are examples of events that can prevent interspecific breeding EXCEPT:
a. the potential mates do not meet
b. the potential mates experience behavioral isolation
c. the potential mates have different courtship rituals
d. the potential mates have similar breeding seasons
e. the gamets of potential mates have biochemical differences
(ok I think its d….. ya like we are only half way through the material but he gave us ap bio rev questions to do to prepare for the ap test… and I remeber this from bio not ap I think it’s d… ya…but too lazy to delete this question)

3. In woody dicots, primary xylem and phloem cells are replaced by secondary xylem and phloem cells that arise from the
a. apical meristem
b. epidermis
c. vascular cambium
d. cork cambium
e. lenticels

4. During the period when life is believed to have begun, the atmosphere on primitive Earth contained abundant amoutns of all the following gases EXCEPT
a. oxygen
b. hydrogen
c. ammonia
d. methane
e. water