What is a keystone species?
a. organism that moves somewhere else
b. organism that firsts settles a new habitat
c. organism that lives where it is not native
d. organism that an entire ecosystem depends on

The process by which natural forces move weathered rock and soil brim one place to another is called

Kelly ran electricity though a sample of water using electrolysis. the water changed into two gases, x and y. it was not possible to break down the gases x and y into simpler particles.

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19