What benefits do nitrogen-fixing organisms provide in an ecosystem?
a. they release nitrogen compounds into the air
b. they convert nitrate into gaseous nitrogen
c. they turn atmospheric nitrogen into organic nitrogen compounds.
d. they eat organisms that contain large amounts of nitrogen compunds

Isotopes of the same element have differ in their

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere

Overtime the pond slowly becomes more acidic due to the release of chemicals from a nearby factory. which of the organisms would most likely survive the change to their environment?