Please help! will mark branliest

Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

What happens when the cell copies its chromosomes

Which of the following would be a body response when stepping outside without a coat on a snowy day? a. senaceous glands. secrete more senum b. more liquid is transported by the body to the skin fir insulation c. blood vessels in the skin narrow and contract d. blood vessels in the skin expand