List biological indicators that you could use to find out if an area is polluted.

they are known to reach a speed of 21 miles per hour

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.

i am sorry but i need more information and a picture.

it should be d) transitional fossils.

they show the gradualism of evolution throughout a period of time