The movement of gases from an area of higher concentration to an area of lower concentration is called

How does friction with the atmosphere affect the speed of an artificial satellite

Which statement describes characteristics of planarians? a they live in oceans, are parasites, and reproduce only sexually. b they live in fresh water, are parasites, and reproduce only asexually. c they live in oceans, are free living, and reproduce sexually and asexually. d they live in fresh water, are free living, and reproduce sexually and asexually.

People with one sickle cell allele are not likely to get malaria. what is this an example of?