The diffusion of water across a membrane is known as ____
a. osmosis
b. active transport
c. facilitated diffusion
d. movement through a channel
e. carrier mediated transport
ANSWER: a
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_____ was the first hominin to leave Africa and did so around _____ million years ago
A. Homo ergaster (H. erectus); 2 B. Ardipithecus ramidus; 4 C. Australopithecus afarensis; 3.2 D. H. neanderthalensis; 0.6 E. H. habilis; 1.7
The figure above illustrates one possible ____
structure of ____. a. primary; proteins b. primary; carbohydrates c. primary; lipids d. secondary; proteins e. tertiary; proteins
Floods and fires are examples of ________, which can dramatically and unpredictably reduce populations
A) demographic factors B) density-dependent factors C) logistic growth factors D) environmental resistance E) biotic factors
How do primary producers provide energy for the food chain?
A. They receive energy from primary consumers. B. They pass on organic substances from secondary consumers. C. They make their own organic molecules via photo- or chemosynthesis. D. They break down organic molecules into inorganic elements.