anion or cation? calcium
What will be an ideal response?
cation
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How do ray-finned fish keep from sinking?
a. they are constantly swimming b. their fins are constantly moving c. they have lungs that are always filled with air d. they have a swim bladder that is filled with gas e. they have a skeleton that is less dense than the surrounding water
In mitosis, if a parent cell has 16 chromosomes, each daughter cell will have how many chromosomes?
A) 64 B) 4 C) 32 D) 16 E) 8
Which statement best describes the current scientific view of birds?
A) a group of feathered, endothermic dinosaurs B) a group of feathered, ectothermic lizards that lack teeth C) a group of flying, endothermic reptiles that have lost teeth, the amniotic egg, and other heavy body features as an adaptation for flight D) a group of flying mammals that are derived from monotremes, which also lay amniotic eggs
The following is true of quarternary ammonium compounds EXCEPT
A) they are non-toxic at lower concentrations. B) they are tasteless. C) they are effective when combined with soaps. D) they are stable. E) they may be an ingredient in mouthwash.