Which of the following statements is false?
a. Heat loss represents a one-way loss of energy from an ecosystem.
b. Organisms in the food chain are able to utilize all the energy contained in the food that
they eat.
c. In some ecosystems, the majority of the energy stored in plants does not become available
until the plants die.
d. Heat and energy are lost by each organism in the ecosystem.
e. The two food webs are classified as grazing and detrital.
B
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The release of acetylcholine from the terminal of a motor neuron is most directly linked to the _____
A) entry of potassium into the axon terminal B) exit of potassium from the axon terminal C) entry of sodium into the axon terminal D) exit of sodium from the axon terminal E) entry of calcium into the axon terminal
As a physician listens to the heart of a human patient, he hears an atypical "lub" sound. Which part of the heart might be malfunctioning?
A. the AV valve B. the semiliunar valves C. the right atrium D. the right ventricle
Primary carnivores are
a. primary consumers. b. secondary consumers. c. tertiary consumers. d. primary producers. e. secondary producers.
Why must organisms that spawn release huge numbers of eggs and sperm?
What will be an ideal response?