Which sentence describes the action of natural selection? an ecosystem contains two types of giraffes, some with short necks and others with long necks. the distribution of this trait is equal among the population. a disease causes low-lying shrubs to die out. the long-necked giraffes can access more food, so they have a better chance of surviving to reproductive age.

The long-necked giraffes can access more food, so they have a better chance of surviving to reproductive age.

The long-necked giraffes can access more food, so they have a better chance of surviving to reproductive age.

Explanation:

The natural selection can be define as the differential selection and reproduction of some individuals of the population who have better phenotypic traits which help them to survive and reproduce in adverse environmental conditions.

Among the given options,  The long-necked giraffes can access more food, so they have a better chance of surviving to reproductive age. is the correct action of natural selection. As the long necked giraffes will be capable of gathering food from the tree tops which will help them to stay healthy and produce offsprings as compared to short necked giraffes. Here, long neck is the phenotypic trait which has benefited the giraffes.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg