I need help with multiple choice question?

Question

1. In a woody stem, cork cambium

a. forms phloem by producing sieve tubes.

b. forms xylem by producing vessel cells.

c. produces the cells of the outer bark.

d. becomes vascular cambium.

2. When the blood enters the gill filaments in a fish, its carbon dioxide content is _____ and oxygen content is ___.

a. low; high

b. low; low

c. high; low

d. high; high

3. The final function of the digestive system is

a. absorption.

b. ingestion.

c. elimination.

d. peristalsis.

4. An allergic response is caused by

a. histamine.

b. harmless antigens.

c. increased mucous production.

d. all of the above.

Thanks!!!

Answer 1

I'm not sure about 1, but...

2. c

3. c

4. a (I'm pretty sure)