What factors in the environment cause weathering

What two fields of study provide the core information that is used to classify organisms?

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

20. in humans, freckles are dominant to no freckles. trey has no freckles and his wife anna grace has freckles, but her dad doesn't. they want to know what percentage of their kids would look like trey. show a punnett square to support your answer.