Because the Epipelagic Zone (or Euphotic Zone) receives enough sunlight for photosynthesis to occur. Since those tiny organisms who live there such as cyanobacteria and planktons are photosinthetic ones, they make up the base of the food chain and therefore are called primary producers. If they ceased to exist we would face several problems from loss of breathable air to food shortage.
Both organisms are composed of cells, the basic unit of life, with each cell surrounded by a cell membrane.
The biggest difference between prokaryotes and eukaryotes is that eukaryotes have a nucleus. They also have other membrane structures called organelles.
<u>Unusually cold winter</u> is a density-independent factor for a flock of Canada geese on a large lake.
Density independent factors mean that those factors/variables affect the density of the population. However, the density of the population, on the other hand, does NOT affect the variable.
Explanation:
The other factors are density-dependent except unusually cold winter. The cold is not affected by the population density of the Canadian geese. However, an increase in cold causes the population density to decrease because some individuals in the population will be unable to cope with the cold. Only individuals with traits favorable in the bitter cold survive.
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For more on dependent and independent variables check out;
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Hi the major carriers of dietary fat from the intestines are called chylomicrons.
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