An evolutionary tree depicts species' relationships based on descent from shared ancestors.
a. true
b. false
a. true
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Which of these are amniotes?
A) amphibians B) fishes C) turtles D) lungfish
A(n) ____ is a group of neighboring populations that exchange individuals
a. K-selected species b. Type I species c. r-selected species d. sink population e. metapopulation
Toxicants occurring in aquatic ecosystems are highly subjected to biological magnification, meaning the
A) pollutants take a long time to break down. B) pollutants occur in higher concentrations in tissues of organisms higher up the food chain. C) toxic chemicals specifically target primary producers, disrupting the entire food web. D) chemicals are converted to more toxic compounds once in the water. E) toxic chemicals accumulate in the upper (photic) zones of the water.
If a bird eats an insect that ate a plant, the bird is considered a(n)
A) autotroph. B) producer. C) secondary consumer. D) primary consumer. E) tertiary consumer.