Which of the following best explains ways in which fish and mammals differ?

The one that best explains ways in which fish and mammals differ is : fish are ectothermic and lays eggs to reproduce, while mammals are endothermic and give birth to offspring

The 'common fish' that give birth to its offspring such as whales and dolphins are considered mammals

hope this helps

Yes it is hereditary because of the penis

Humans can affect weathering and erosion in several ways.  humans cause  increases in acid rain and pollution, which increase the amount of  weathering  agents in the air and water, and then on land.for an easy answer: 1) acid rain2) pollution