Why do many animals do most of their calling at dawn and dusk?
A. Most predators are not active at those time.
B. Air is less turbulent and carries sound better.
C. Pheromones are also released at dawn and dusk.
D. Animals preferentially mate at night.
E. Such imprinting behaviors are better received at those time.
B. Air is less turbulent and carries sound better.
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Explain the process of site-directed mutagenesis, and discuss some applications of this technique
What will be an ideal response?
In relation to malaria and P. falciparum, the human liver and circulatory system (especially red blood cells) are both locations that:
A. have immune system cells that express the PfEMP1 T cell receptors. B. contain P. falciparum during some stage of its life cycle. C. have immune system cells that can effectively keep up with P. falciparum's antigenic variation. D. demonstrate granulomas in response to P. falciparum infection.
Plants and algae contain this organelle not found in heterotrophs:
a. nucleus. b. mitochondria. c. chloroplasts. d. flagella.
Who discovered Homo habilis?
A. Louis Leakey B. Mary Leakey C. Richard Leakey D. Andrew Hill E. Don Johanson