Ligand is a term which can be used to describe which of the following?
A) a chemical messenger
B) a neuron
C) a receptor
D) none of these
A
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Explain how energy and nutrients flow through ecosystems.
What will be an ideal response?
A parcel of air at the surface is heated, which expands the air and increases the parcel's volume. If the same number of air molecules occupy the greater volume, density decreases. The increase in volume results in lower pressure. What will happen to the air surrounding this parcel?
A) More dense air rises at the surface. B) Less dense air sinks at the surface. C) Less dense air flows in to replace the rising air. D) Denser air flows in to replace the rising air.
Most near shore sediments smell of hydrogen sulfide due to high levels of decomposing organic matter
Indicate whether the statement is true or false
The method of desalination in which seawater is forced against a semipermeable membrane at high pressure is called ____
A) reverse osmosis B) distillation C) reverse diffusion D) hydrostatic filtration