A zygosporangium is produced by
A) the union of two haploid hyphae.
B) meiosis of megaspores.
C) mitosis of hyphae.
D) the union of egg and sperm.
E) meiosis of hyphae.
A
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The most immediate effect of sexual displays and contests in animals (such as bighorn sheep bashing their heads together) is:
A) differential mating success. B) mutations. C) disruptive selection. D) stabilizing selection.
The efficiency of energy transfer between trophic-levels averages about
A. 33%. B. 10%. C. 1%. D. 25%. E. 0.1%.
Describe the hypothesis of viruses occurring before living cells and how DNA might have evolved. What is the current hypothesis about the evolutionary relationships between RNA, DNA, viruses, and cellular life?
What will be an ideal response?
A vast majority of scientists agree that disruption of the carbon cycle by human activities is altering the Earth’s climate and warming the planet
1.True 2.False