What is active transport? A. an organism's way of getting materials to its community
B. a cell's way of transporting materials that uses energy
C. the nucleus's way of transporting genetic information
D. when peroxisomes moving materials in a cell

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.

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.