It's C.
Can't be D cause DNA is made of genes.
Answer:
The smaller object will move at 30 m/s
Explanation:
From the principle of conservation of linear momentum,
Momentum of objects before collision = momentum of objects after collision.

where
are the masses and velocities of the objects 1 and 2 respectively before collision.



Hence, the object will move at 30 m/s
<span>Are pollution can cause acid rain and the acid rain can hurt lots of living things. </span>