Q: What are microscopic vessels with very thin, porous walls? Choices: - veins - arteries - valves - capillaries A:
capillaries

(Question)
Q: Protozoa are generally difficult to identify due to what? Choices: - their hidden shape - their resting shape - their formation shape - their varied shape A:
(Answer)
their varied shape

Ques: Q: What do the liver, gallbladder, and pancreas contribute that aid in digestion? Choices: - contaminants - crystals - plasma - chemicals A:
Ans: chemicals

(Q).
Q: What is the name of the temporary organ that begins to form from the trophoblast layer of cells shortly after implantation? Choices: - uterus - embryo - appendix - placenta A:
(A).
placenta

Ques:Q: As a diver descends, the increase in pressure causes the body's air pockets in the ears and lungs to do what? Choices: - heat up - expand - blow up - compress A:

Ans:compress

Ques:Q: Which is the ultimate energy source in a bear's food chain? Choices: - decomposers - plants - heat - sun A:

Ans:
sun