Cara and sam had to illustrate one newton's laws. they drew this model to represent the law of motion which can also be represented by the equation f = ma.
a) first
b) second
c) third
d) fourth

The model depicts the second law of motion.

Explanation :

According to Newton's second law of motion :

F = ma

where,

F is the externally applied force

m is the mass of an object

a is the acceleration produced

We can say that acceleration is inversely proportional to the mass of an object.

Higher the mass, less will be the acceleration.

So, the model illustrated by Cara and Sam represents Newton's second law of motion.

Hence the correct option is (B).

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

it would be heredity