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The Following Experiment Is Used for the Corresponding Question

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The following experiment is used for the corresponding question.
A researcher discovered a species of moth that lays its eggs on oak trees. Eggs are laid at two distinct times of the year: early in spring when the oak trees are flowering and in midsummer when flowering is past. Caterpillars from eggs that hatch in spring feed on oak flowers and look like oak flowers. But caterpillars that hatch in summer feed on oak leaves and look like oak twigs.
How does the same population of moths produce such different-looking caterpillars on the same trees? To answer this question, the biologist caught many female moths from the same population and collected their eggs. He put at least one egg from each female into eight identical cups. The eggs hatched, and at least two larvae from each female were maintained in one of the four temperature and light conditions listed below. The following experiment is used for the corresponding question. A researcher discovered a species of moth that lays its eggs on oak trees. Eggs are laid at two distinct times of the year: early in spring when the oak trees are flowering and in midsummer when flowering is past. Caterpillars from eggs that hatch in spring feed on oak flowers and look like oak flowers. But caterpillars that hatch in summer feed on oak leaves and look like oak twigs. How does the same population of moths produce such different-looking caterpillars on the same trees? To answer this question, the biologist caught many female moths from the same population and collected their eggs. He put at least one egg from each female into eight identical cups. The eggs hatched, and at least two larvae from each female were maintained in one of the four temperature and light conditions listed below.   In each of the four environments, one of the caterpillars was fed oak flowers, the other oak leaves. Thus, there were a total of eight treatment groups (4 environments × 2 diets) . Which of the following is a testable hypothesis that would explain the differences in caterpillar appearance observed in this population? A)  The longer day lengths of summer trigger the development of twig-like caterpillars. B)  Winter causes ugly caterpillars and trees. C)  Differences in air pressure, due to differences in elevation, trigger the development of different types of caterpillars. D)  Differences in diet trigger the development of different types of caterpillars.
In each of the four environments, one of the caterpillars was fed oak flowers, the other oak leaves. Thus, there were a total of eight treatment groups (4 environments × 2 diets) .
Which of the following is a testable hypothesis that would explain the differences in caterpillar appearance observed in this population?


Definitions:

Double Declining Balance

A method of accelerated depreciation which doubles the straight-line depreciation rate, resulting in higher depreciation expenses in the early years of an asset's life.

Depreciation Rate

The rate at which an asset's value is reduced over time for accounting and tax purposes.

Asset Retirement Obligation

A legal obligation associated with the retirement of a tangible long-lived asset, where the entity is required to remove or dispose of the asset.

Contra-Liability Account

An account that decreases the balance of a related liability account, representing a credit balance in the liability section of the balance sheet.

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