Scientists have an ethical responsibility to avoid harm to people, animals, and the environment.
true
false

True

Explanation:

Scientist have to care for everything and make sure it doesn't harm anything a lot, scientist are supposed to work carefully

increase masses, decrease separation

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.