Answer:
D or A
50 percent chance of getting it right
Explanation:
Biologically: Nitrogen gas (N2) diffuses into the soil from the atmosphere, and species of bacteria convert this nitrogen to ammonium ions (NH4+), which can be used by plant
The stage where the flatworm’s contraction response to light
is established and gradually strengthened is called acquisition. Acquisition is
a process where something or an individual acts of having to gain or obtain
something from a particular source or thing that it gained from.