Which Process of Development involves cells taking on a specific structure and function?
a. cleavage
b. growth
c. morphogenesis
d. differentiation
Answer: d. differentiation
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Which one of the following is a primary component of both living organisms and the Earth's crust?
A. silicon B. hydrogen C. oxygen D. carbon E. nitrogen
In flowering plants an ovary is part of a(n) ____
calyx
a. corolla b. ovule c. calyx d. stamen e. carpel
Carbon returns to the atmosphere
A. from respiration of plants. B. by the burning of fossil fuels. C. All of the answer choices are correct. D. from respiration of animals. E. as carbon dioxide.
Why is gas exchange in an aquatic environment more challenging than gas exchange in the air?
A) Gills have a poor blood supply. B) Carbon dioxide is eliminated by active transport in an aquatic environment. C) Less oxygen is available in water than in air. D) The countercurrent exchange process limits the amount of oxygen that can be extracted from water. E) The large surface area of gills makes them more susceptible to drying out.