Overproduction of melatonin by the pineal gland may cause __________.
Fill in the blank(s) with the appropriate word(s)
Answer: Seasonal affective disorder
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One unique feature of fertilization in flowering plants compared with animals is that _____
A) only plant sperm are motile B) fertilization in flowering plants involves double fertilization C) fertilization in flowering plants does not involve nuclear fusion D) in flowering plants the gametes are diploid, not haploid as they are in animals
__________ behavior can occur without having been learned by experience. Fill in the blank(s) with the appropriate word(s)
Decomposers recycle materials at ____ trophic
level(s). a. the first b. the second c. the third d. the fourth e. any of these
Animal cells have all of the following EXCEPT:
A) a nuclear envelope B) mitochondria C) golgi apparatus D) chloroplasts