Why are scientist most likely working on developing cleaner-burning fuel for cars? a) to increase fuel consumption b) to increase fuel production c) to reduce noise pollution d) to reduce air pollution

Correct D). To reduce air pollution

There is need to develop a cleaner burning fuel in order to protect the environment from the air pollution caused due to the emission of carbon monoxide and sulfur dioxide in the air, which are known to cause air pollution and harm the human health and wildlife as well.

The incomplete combustion of fossil fuel used in the car is causing great damage to the atmosphere and results in global warming and the greenhouse effect.

Hence, there is a need to develop an alternative fuel that are cleaner and does not cause air pollution. Example solar energy, wind energy, bio-fuel etc.

25%

Explanation:

In sheep, the allele for belly fur (A) is dominant to the allele for no belly fur (a). A mother with the genotype Aa and a father with the genotype Aa produce an offspring. What is the percent chance that the offspring will have NO belly fur?

Allele A is dominant over allele a.

Genotype of mother = Aa

Genotype of father = Aa

Crossing Aa and Aa:

Aa   x   Aa = AA, 2Aa, and aa

Since A is dominant over a, both AA and Aa have belly fur.

Hence, the ratio of the offspring with belly fur to those without belly fur is 3:1.

Percentage of the offspring without belly fur is 25%.