How can we explain the exquisite complexity of some complex traits such as the vertebrate eye?
a. Each intermediate step toward the evolution of complex traits was itself adaptive.
b. Intermediate stages of complex traits were functional and selected for in the past, but were se-lected for a function other than that observed today.
c. Both A and B are true.
d. Neither is true.
C
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The primary neurotransmitter at neuromuscular junctions in skeletal muscle is _________.
A. glutamate B. acetylcholine C. norepinephrine D. GABA
Taste buds that are more sensitive to sweet flavors than to others are located ________
A) on the tip of the tongue B) on the back of the tongue C) on the side of the tongue D) all over the tongue, as sensitivity to sweet is distributed throughout the tongue
Answer the following questions true (T) or false (F)
1. Corals exhibit the polyp body form only. 2. There are both aquatic and terrestrial species in the phylum Mollusca. 3. There are more species in the insect group of phylum Arthropoda than all other animal phyla combined.
The biological oxygen demand is a metric to indicate the capacity of
a. autotrophs in the water. b. microbes to oxidize organic compounds. c. primary producers. d. all of the above.