Describe three societal needs that drive scientific endeavor and give an example of a scientific endeavor associated with each.

The answer is:

1.Cure disease

2.Improve livelihoods

3.Understand nature and themselves.

1. Disease has plagued humans since the first man. Therefore, man has always used science to seek a cure for any emerging disease such as cancer today

2. Humans use science to improve livelihoods such as means of faster traveling and increasing yields in the fields

3. Science has been used to understand humans and the environment in which they live. This is evident with the numerous scientific probes that explore the earth and space collecting and analyzing data.

wavelength variability is the right one

answer; equivalent to a one(1) horsepower motor;