Which of these are likely to be pioneer organisms?
A. lichens, moss, grass, and insects
B. elephants and deer
C. rabbits, grass, trees, and birds
D. mice and men
A. lichens, moss, grass, and insects
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Imagine that scientists have discovered a new planet apparently devoid of life, but having ice caps located at the poles
These ice caps reveal that the planet's atmospheric O2 levels sharply increased about 1,000,000 years ago, but then quickly dropped 50,000 years ago. What could have accounted for these changes in atmospheric O2 levels? A. Photosynthetic organisms evolved on the planet 100,000 years ago, but went extinct 50,000 years ago. B. Photosynthetic organisms evolved on the planet 50,000 years ago. C. Oxygen-based mammalian life evolved on the planet 100,000 years ago, and photosynthetic organisms evolved 50,000 years ago. D. Oxygen-based mammalian life evolved on the planet 100,000 years ago.
During meiosis in an organism where 2n = 8, how many chromatids will be present in a cell at the beginning of meiosis II?
a. 2 b. 4 c. 6 d. 8 e. 12
In endotherms, an increase in mass-specific metabolic rate lowers production efficiency
Indicate whether the statement is true or false
Chagas' disease is transmitted by a bug with mouthparts that penetrate blood vessels. Which type of exposure does this represent?
A) mucous membrane portal B) parenteral route C) skin portal D) contact E) fomite