Which human activity does not affect earth systems

How many chromosomes are in a gold fish?

Variety of living organisms; includes genetic, species, and ecological types.

Rachel ate a piece of fruit and happened to drop the seeds in her backyard. after a few weeks, she saw a small plant with flowers growing in the backyard. which group does this plant belong to? a. angiosperms b. gymnosperms c. pteridophytes d. bryophytes e. chytrids