Plants are photosynthetic. So, they prepare their own food by using raw materials from atmosphere like CO2, H2O and sun’s energy. CO2 is the carbon source for the synthesis of glucose through array of enzyme catalysed biochemical reactions taking place in chloroplast of plant cell.
Animals are heterotrophic in nutrition. So, they get energy; i.e. glucose from the food they eat. It depends on what is their food source. For example, herbivorous animals eat variety of plants, starch and cellulose of which become glucose source. Carnivorous animals eat other animals, whose stored glycogen or fat becomes energy source for them.
Along with other distinct traits, robust australopithecines had large temporalis muscles and a sagittal crest, and large premolars and molars adapted for grinding food.
Robust australopithecines belong to the Australopithecus genus, they are known as robust because of their dietary adaptations that allowed them to eat hard and fibrous food that needs vigorous chewing and grinding.
They were adapted to eat seeds, nuts, plant roots, tubers, etc. They had large temporalis muscle (major muscle for chewing) and a large sagittal crest for attachment of temporalis muscle to the skull for chewing hard and fibrous foods.
They also had large premolars and molars to aid in chewing tough plant materials like roots and tubers.
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The conclusion of this experiment would be the Euglena cells, which are both autotrophic and heterotrophic remain alive even in the absence of sunlight because they are able to feed on the organic materials that are present in the pond water. The correct option among all the options that are given in the question is the third option or option "C".
The correct answer is c. commensalism.
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Commensalism is a type of symbiosis in which only one species benefits without causing significant harm to the other. Barnacles live on the backs and bellies of whales and have <span>two basic benefits from this commensalistic relationship. Protection from predators is one and other is easier filter-feeding.</span></span>