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A population is described as the total number of organisms of the same species living together in a given area at a particular time.

Ecological niche refers to the specific portion of a habitat which is occupied by a particular species or organism. It is the functional position of an organism within the community.

Respiration can either be aerobic or anaerobic respiration. Hence, in plants, all living cells take part in a form of respiration. Plant respiration is a rather diffuse process. It occurs all over the plant.

Discontinuous variation is the differences of variations in behaviour by which organisms can be grouped into 2 or more classes within a population without any intermediates among them e.g Behaviour, ability to roll tongue.

Clay soil is the soil with highest water retaining capacity.

Rabbits does not have the adaptive features of an aquatic habitat like gills therefore, it cannot survive in an aquatic habitat.

Water passes through the root cell membrane of plant in order for osmosis to take place.

Trees in savanna habitats have developed thick, corky bark primarily as an evolutionary adaptation to survive the frequent bush fires that characterize these ecosystems during the dry season. The bark acts as a natural insulator, protecting the sensitive internal living tissues—specifically the cambium and vascular systems—from the intense heat.

Competition one of the biotic factors in ecological factors involves the interactions among two organisms of the same species/different species which outgrows the other and survives while the other cannot grow or survive

In natural selection, Darwin proposed that evolution occurred because of the following conditions except food and other needs are abundant

Fats provides more energy to animal than carbohydrates therefore containing the highest amount of energy in joules per unit weight.

Landsteiner and Lavine are scientist, they discovered the Rhesus factor in human blood.

Autecology is the study of an individual organism or a single specie of organism and no environment

Nitrobacter are chemoautrophic organisms found in soil and water responsible for the oxidation of ammonium to nitrite and nitrite to nitrate.

One of the effect of using artificial pollination in plant breeding is that it improves the variety of crops.