While on a field trip near the ocean coastline, you visit a company that harvests jellylike substance from protists. This substance can be used as food, or in biology lab dishes for culturing organisms that have red-blue pigments, and store starch like plants. The company extracts the substance from multicellular plant-like organisms. You are observing the economic values of
A. algin.
B. gelatin.
C. carrageenan.
D. red ooze.
E. agar.
E. agar.
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Nitrogen-fixing bacteria convert atmospheric nitrogen (N2 gas) into ammonium (NH4). Why is this conversion important for life on Earth?
A. Nitrogen gas is toxic. B. Ammonium is an important cleaning agent. C. Nitrogen gas leads to global warming. D. Ammonium is a very important plant nutrient.
The main natural source of phosphorus is
a. Earth's crust. b. fertilizer. c. guano. d. legumes. e. water.
One kind of acid rain forms when _____ from coal-fired power plants combines with water vapor in the air
a. nitrogen oxides b. sulfur dioxides c. sulfuric acid d. calcite e. aluminum
Which of the following is NOT a source of
heritable variation in traits among individuals of a population?
a. mutation b. crossing over c. independent assortment d. fertilization e. mitosis