All life on Earth exists in a region known as: A. ecology. B. a biome. C. biomass. D. the biosphere.

The series of steps in which a large fish eats a small fish that has eaten algae is a a. food web b. food chain c. pyramid of numbers d. biomass pyramid

biomass , biome

The unique properties of Earth make life possible. What are the five basic necessities that all living things need to survive on Earth?

The sun's rays strike Earth most directly at the a. poles. b. equator. c. temperate zones. d. Gulf stream.

Which biome is characterized by permafrost?

Nutrients move through an ecosystem in a. biogeochemical cycles b. water cycles. c. energy pyramids. d. ecological pyramids.

Pair the correct organ with its disease or condition and write a brief definition of the term.

Term: cholecystitis

Organ: $\quad\rule{4cm}{0.15mm}$

Definition: $\quad\rule{8cm}{0.15mm}$

Which is a source of energy for Earth's living things? A. wind energy only B. sunlight only C. wind energy and sunlight D. sunlight and chemical energy

During ________________ selection, both extreme phenotypes are selected for.

Can one gene have several different forms, resulting in more than two phenotypes?

The total amount of living tissue at each trophic level in an ecosystem can be shown in a(n) a. pyramid of energy. b. pyramid of numbers. c. pyramid of biomass. d. biogeochemical cycle.

(a) Recall: According to the speaker, how will Margaret change as she grows older?
(b) Draw Conclusions: What lesson does the speaker offer to Margaret in this poem?

Summarize the role of algal blooms in disrupting the equilibrium in an aquatic ecosystem.