Which of the following is an example of a biological system?
O
A. The water flowing through the Mississippi River
O
B. All of the living and nonliving things that interact in an area
O
C. A video describing how fish interact with the living and nonliving
things around them
O
D. A presentation about the environmental impact of a planned new
development in your town

B.) because biology is talking about living things and thats living things interacting.

Explanation:

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.