Answer: Interventional Study
Explanation: When a treatment group is compared to standard (control) group it is called Interventional Study
Answer:
Temperate coniferous forest is a terrestrial biome defined by the World Wide Fund for Nature. Temperate coniferous forests are found predominantly in areas with warm summers and cool winters, and vary in their kinds of plant life.
C. Decreased death rate is the answer
Here, given-
homozygous alleles 'a' have a frequency of 0.3.
Also the alleles are in equilibrium in a Hardy-Weinberg population. The frequency of individuals that are homozygous for this allele are= 0.49.
The Hardy-Weinberg equilibrium can be defined as the principle which states that the variation in the genetic makeup of a population remains constant and unchanged till there are no external interferences, influencing the population.
Calculation-

Then to find the frequency of the individuals homozygous for this allele the following formula needs to be used-


Thus, the individuals homozygous for the allele can be calculated by 
Learn more about the Hardy-Weinberg equilibrium here-
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Herbivores: Bubbles (yellow tang), Bruce (turtle), Dory.
Carnivores: The three sharks. Chum (maiko shark), Bruce (great white shark), Anchor (Hammerhead shark).