All of the following protect the skin and mucous membranes from infection except
a) multiple layers of cells.
b) tears.
c) saliva.
d) hcl.
e) the "ciliary escalator."

Plz ! what does it mean for an allele to be dominant?

Communication and transportation have improved as a result of scientific advancements. select the best answer from the choices provided of mark this and return save and exit next

Achange in which factor will affect the rate of reaction only when gases are involved? temperature pressure surface area concentration