When the energy flow through an ecosystem is measured at each trophic level, ________ of the available energy passes from one level to the next.
A. 1% to 2%
B. 5% to 20%
C. 25% to 35%
D. 36% to 45%
E. 46% to 55%
Answer: B
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Did Darwin develop his theory of evolution through experimentation or observation or other methods?
A. Experimentation. B. Observation. C. Both experimentation and observation because he collected samples but also worked experimentally with finches. D. Mathematical analysis of experimental data.
Many animals share homologues of the gene PAX6, which is important in the development of ________
a. legs b. eyes c. segmentation d. wings
Both bacteria and fungi digest food by
A) ingesting previously decomposed molecules. B) forming food vacuoles through phagocytosis. C) secreting enzymes and then absorbing the smaller molecules. D) photosynthesis. E) eating only small organisms that they can engulf.
Endemic murine typhus is transmitted by
a) Xenopsylla cheopis. b) Ixodes spp. c) Dermacentor variabilis. d) Pediculus humanus corporis.