All multicellular organisms begin as a skin cell. within four or five days, that first cell multiplies into a ball-like structure of about 100 cells. what is this structure called? a. blastocyst b. blood c. placenta d. heart

Astudent drew the following flowchart to show the movement of nutrients. soil → roots → plants →? where does nitrogen go next? a. directly into nearby animals as nutrition b. directly into aquifers through condensation c. directly into the air through evaporation d. directly into nearby plants during fixation

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

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his 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