Q: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only do what? Choices: - vibrate - pull - expand - contract A:
contract

(Question)
Q: What nerves are connected to the spinal cord? Choices: - primary nerves - posterior nerves - superior nerves - spinal nerves A:
(Answer)
spinal nerves

Ques: Q: Laid on dry land by reptiles, amniotic eggs have what that prevents them from drying out? Choices: - double shells - double yolks - oil coating - waterproof membranes A:
Ans: waterproof membranes

(Q).
Q: Which type of bryophytes are named for their horn-like sporophytes? Choices: - arthropods - flatworms - tapeworms - hornworts A:
(A).
hornworts

Ques:Q: Which type of isomers generally have lower boiling and melting points than straight-chain isomers? Choices: - straight-chain isomers - branched-looping isomers - branched - solar isomers - branched-chain isomers A:

Ans:branched-chain isomers

Ques:Q: The hormones epinephrine and norepinephrine are released by what? Choices: - uptake medulla - nutrients medulla - external medulla - adrenal medulla A:

Ans:
adrenal medulla