The mode of natural selection in which extreme phenotypes are less fit than the optimal intermediate phenotype is
A. convergent selection.
B. disruptive selection.
C. artificial selection.
D. directive selection.
E. stabilizing selection.
E. stabilizing selection.
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Which conclusion is best supported by these data?
1.Infected children lived in areas with greater numbers of mosquitoes.
2.A higher number of mosquitoes were attracted to children that contained gametocytes.
3.Plasmodium secrete a chemical that mosquitoes can detect in the air.
4.Children without Plasmodium infection were least attractive to mosquitoes.
Which blood vessels contains oxygenated blood?
1.arteries 2.capillaries 3.veins 4.All of these contain oxygen at some point during the circuit.
The risk of predation can sometimes have a significant impact on the foraging choices made by animals
Indicate whether the statement is true or false
The basis of the membrane filter technique is that
A. bacteria are small enough to go right through the filter. B. the dilutions of the sample allow a total bacterial count when plated out using pour or spread plates. C. bacteria are larger than the holes in the filter. D. the membrane has an antibiotic that kills bacteria in the water.