Different species of heterotrophic unicellular organisms such as amoeba and Actinobacteria are found in freshwater sources. The feature that distinguishes amoeba from Actinobacteria is the — a) presence of ribosome
b) ability to maintain homeostasis.
c) ability to reproduce.
d) presence of a nuclear membrane.

answer: glucoamylase presented optimum activity at temperature of 55â°c, and, in the glycosidic bonds from the non-reducing ends of starch, resulting in the production of glucose. source and type of fermentation can affect the enzyme's properties

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stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms

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