A woodland ecosystem in equilibrium is wiped out by a forest fire. The sequence of events following this fire is called
A- a disaster
B- primary succession
C- secondary succession
D- pioneer species
I don't know if this is right.

All living organisms are composed of a. only one cell. b. at least 100 cells. c. at least three cells. d. one or more cells.

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Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home.what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point