Q: Q: Each endocrine hormone affects only certain "target" cells, which have molecules of what on the surface that enable binding of a given hormone? A:

OPTIONS:
- lipids
- rna
- gas
- protein

A: protein

input: OPTIONS:
- condensation
- seawater happens
- snow
- humidity happens Now, answer this question: Q: What happens when liquid water evaporates? A:
A:
output: humidity happens

Q: The umbilical cord connects the fetus to what structure? A:

OPTIONS:
- Ovaries
- uterus
- cell
- placenta

Answer: placenta

Problem: OPTIONS:
- overpopulation
- depletion
- mutation
- extinction
Q: Q: By impacting plant species and the animals they support, destruction of habitat threatens what event? A:
Answer: extinction

Problem:OPTIONS:
- a combination
- a solute
- a solution
- a mixture

Q: What is the term for a combination of substances in which there is no chemical reaction? A:
****
A: a mixture

Problem:OPTIONS:
- rectum
- uterus
- bladder
- urethra

Q: What is the name of the muscular tube that carries urine out of the body? A:
****
A:
urethra