PLEASE HELP I WILL GIVE BRAINLIEST(10 points) NON SERIOUS ANSWERS WILL BE REPORTED

What substance in the esophagus lining helps make swallowing easier?

a.

saliva

b.

pepsin

c.

mucus

d.

bile

Please select the best answer from the choices provided

A

B

C

D

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

for 8 am not sure maybe yes?

for 9 if it is asking if the male is more or less it would be less

hope i even just a little : )

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands