Which additional observation would support the conclusion that the deer population is NOT changing size from year to year, meaning that the net population change is 0? A. About 20 deer per year immigrate to the tract of forest. B. About 20 deer per year emigrate from the tract of forest. C. The average life span of a member of the deer population is 20 years. D. If a deer survives its first year of life, its average life span is 20 years.

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms