In most ecosystems, the original source of energy for the living things in the system is _____.
A) the heterotroph
B) glucose
C) the primary producer
D) the sun
D) the sun
The sun supplies light energy that is captured by the chlorophyll in plants and certain single-celled bacteria and protists. The light energy is extracted and stored in the chemical bond energy of organic molecules that are eaten by the other living things in the ecosystem.
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Central Afghanistan is dominated by mountainous areas with limited vegetation except in narrow river valleys and:
A) desert area with limited vegetation B) dry farming and seminomadic herding areas C) forests D) monsoon rain-fed Mediterranean scrub
Volcanic island arcs like the islands of Japan are associated with
A. ocean-ocean convergence B. ocean-continent convergence C. transform boundaries D. divergent boundaries
The nervous system releases hormones at synapses and the endocrine system releases neurotransmitters into the bloodstream.
a. true b. false
Energy can be extracted from tides by ________.
A. the rise and fall of the water B. only from diurnal tides C. the declination of the tides D. the horizontal movement of water in tidal currents E. the rise and fall of the water and the horizontal movement of water in tidal currents