A 300-N force gives an object an acceleration of 1.5 m/s^2. The mass of
the object is

200 kg

Explanation:

Acceleration = 1.5 m/s^2

Force = 300 N

Force = mass * acceleration

mass = force / acceleration

mass = 300 / 1.5

mass = 200 kg

28. evolution

29. environment, survive, offspring  

explanation:

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).