Three examples of respiratory poisons are ___, ___ and ___.
Fill in the blank(s) with the appropriate word(s).
Ans: CO, cyanide and azide
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What is the most likely explanation for the extinction of giant kangaroos in Australia?
a. glaciers b. asteroids c. hunting d. giant squid
The amniote egg, in which an embryo could develop completely on dry land, arose during the _____ period.
A. Cambrian B. Ordovician C. Devonian D. Silurian E. Permian
Meiosis in female humans is completed
a. before birth. b. shortly after birth. c. during the ovarian cycle. d. at fertilization. e. when a woman is fully mature
There are no trees in the tundra because:a
of the short growing season. b. of the limited supply of nutrients in the soil. c. of limited root penetration due to permafrost. d. of limited precipitation.
e. of low temperatures.