A food chain can usually sustain no more than six energy transfers before all the energy is used up. And so less energy is transferred at each level of the food chain so the biomass gets smaller.
<span>There are two concerns. First, that the turkey meat not spoil, for which it is recommended that a cooler with ice be available to keep the meat at a safe temperature. Second, that the person carrying the turkey is safe, for which the individual should use care with knives and gloves.</span>
Answer:
The doldrums are commonly found around the equator. The doldrums are an area characterized by calm monotonous weather.
Answer:
The correct answer is b. must be present in a population before natural selection can act upon the population
Explanation:
Genetic variation can be caused by mutation, recombination between chromosomes during meiosis and by fusion of two genetically different gametes during sexual reproduction.
This genetic variation is necessary for the evolution of any population. Natural selection acts on every individual and it decreases the frequency of those alleles that are not suited for the environment and increase the frequency of those alleles which helps the individual to survive in the changing environment.
Therefore genetic variation must be present in the population before natural selection act on the.
