Which circumstance led to the collapse of the Khmer civilization?
a. road building
b. salty soils from irrigation
c. reforestation
d. change in climate
Answer: d. change in climate
You might also like to view...
Electron microscopes differ from light microscopes in that
(a) electrons are used instead of light. (b) magnetic lenses replace glass lenses. (c) the electron path had to maintained in a high vacuum. (d) a, b, and c are all true.
At term, ____________________ changes initiate and drive the events surrounding birth
Fill in the blank(s) with correct word
Which statement is NOT true about the cells of the nervous system?
A. A myelin sheath is a white insulating layer that covers many axons. B. There may be multiple dendrites on a single neuron. C. A neuron can have only one axon. D. A dendrite is the part of the neuron that carries an electrical impulse away from the cell body. E. A neuroglial cell supports or protects a neuron.
What happens to chromosomes in cells in which the telomerase gene is not expressed or is mutated?
What will be an ideal response?