And an ecosystem there are two colored varieties within a species of toads brown and green, over 50 years. The proportion of the population that is green increases from 20 to 50% which statement is the most likely to explain this change. Would it be a disease cause day decrease in the population of brown toes, or the environment changed such that green toes can blend into their surroundings better or is it pollution cause a decrease in the population of brown toads or would it be the environment changed such that toads that can jump higher into the trees to survive better

The most likely statement to explain the change in the proportion of green toads increasing from 20% to 50% in the population over 50 years would be: "The environment changed such that green toads can blend into their surroundings better."

This statement suggests that the change in environment created conditions that favored the survival and reproduction of green toads. Since green toads can better blend into their surroundings, they may have had a higher chance of escaping predation or being able to hunt more effectively. As a result, their population could have increased over time relative to the brown toads.