Which of the following is true for polar jet streams?
A. They bring cool air
B. They bring warm air
C. They blow at the equator
D. They blow from the North to South

are there any answer choices

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.