Parkinson's disease is caused by ________.
Fill in the blank(s) with the appropriate word(s).
Answer: a shortage of dopamine
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Which era is the oldest?
a. Paleozoic b. Cretaceous c. Mesozoic d. Cambrian e. Phanerozoic
In the process of double fertilization, one sperm fuses with the egg and the other sperm fuses with a
synergid. ____________________ Indicate whether the statement is true or false.
Ribosomes are directly associated with which process?
A) Transcription
B) Translocation
C) Translation
D) Replication
What caused intense selective pressure for terrestrial vertebrates to evolve internal fertilization?
A. Gametes and zygotes are vulnerable to predators. B. The eggs are too small for the males to find and fertilize. C. The gametes could not be released next to each other, as they would soon dry up. D. Terrestrial organisms only produce small quantities of gametes. E. There is no mechanism for eggs and sperm to find one another.