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White tailed deer.

Explanation:

White tailed deer is the organism for which carrying capacity is shown in the graph. the population of organism decreases after reaching its carrying capacity because of limited resources of food that is not available for organisms which leads to the death of organism. The population exceeded its carrying capacity because of favourable condition such as availability of more food. The population decrease after it exceeded the carrying capacity due to unavailability of food to the increased population so they die and decrease occur in population.

answer: 45

explanationyou have to add as well to be it could be

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products