Answer:
a. 4.5secs
Explanation:
From the question, the equation describing the height is given by

at the point when the rock hit the ground, the height,h will be zero.
Hence we can have

hence the rock will hit the ground in 4.5secs
Answer: The correct answer is : B. transduction
Explanation: Transduction is a process through which DNA is transferred from one bacterium to another through the action of a virus or a viral vector. There are two types of transduction, the generalized and the specialized. Transduction is a tool widely used by molecular biologists.
The most suitable option would be C take baths instead of showers.
When doing this, you are using just an amount of water and you avoid water to keep on running. The main idea should be to reduce water usage so you need to pay attention not only when you take a bath but also when you brush your teeth. leave the water running while doing anything is one of the ways in which water is highly wasted