How is salt extracted from the sea?
What will be an ideal response?
Seawater is placed in shallow ponds located in sunny areas. The water is evaporated and a concentrated brine forms. Next, new seawater is pumped into the pond and more evaporation takes placed until a super saturated brine forms. Complete evaporation leads to the formation of salt deposits that are harvested from the pond bed.
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Which hormone might be able to counteract the leaf drop caused by leaking street lanterns observed by Dimitry Neljubov?
A. Ethylene. B. Cytokinins. C. Gibberellins. D. Brassinosteroids.
During the first 5–600 million years on Earth, temperatures ranged from 500–1000°C, atmospheric pressure was 10 times current levels, and the planet was bombarded with meteorites. How would these conditions favor the formation of biological molecules?
A. Many chemical reactions are inhibited by high temperature and pressure. B. High temperature and pressure are the best conditions for enzyme function, needed to support life. C. Oxygen will break down many organic molecules by reduction. D. Oxygen in this high temperature and pressure atmosphere would have been chemically less reactive. E. Water and meteorite dust would have provided the chemical reactions necessary for formation of biological molecules.
In a population of rabbits, some evolve the
ability to outrun foxes. This is an example of ____ selection.
a. directional b. stabilizing c. disruptive d. mutational e. restricted
Bacteria living in salt marshes are most likely which of the following?
A. acidophiles B. barophiles C. halotolerant D. thermophiles