Answer:
Biological evolution refers to the cumulative changes that occur in a population over time. These changes are produced at the genetic level as organisms' genes mutate and/or recombine in different ways during reproduction and are passed on to future generations.
Explanation:
Answer:
bacteria
Explanation:
Nitrogen gas (N2) diffuses into the soil from the atmosphere, and species of bacteria convert this nitrogen to ammonium ions (NH4+), which can be used by plants. Legumes (such as clover and lupins) are often grown by farmers because they have nodules on their roots that contain nitrogen-fixing bacteria.
Fred must have suffered muscle atrophy.
Explanation:
Since Fred broke his leg and a cast was put around his leg,his orthopedic must have suggested restricted movement of his leg as a part of treatment.. Due to this immobilization the muscle mass of his leg may have got wasted and his leg became weak. Being too weak the leg may not have supported the body weight and Fred fell.
Genetic diversity - a population of a spider species...
keystone species - sea otters eat sea urchins...
species diversity - researchers in the amazon...
ecosystem diversity - three populations of insects...
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