In humans, an egg develops into a male offspring if it A). contains a Y chromosome and is fertilized by a sperm containing a Y chromosome. B). contains a Y chromosome and is fertilized by a sperm containing an X chromosome. C). contains an X chromosome and is fertilized by a sperm containing a Y chromosome. D). contains an X chromosome and is fertilized by a sperm containing an X chromosome.

C. Contains an X chromosome and is fertilized by sperm containing a y.

Explanation:

The male genotype = XY the female = XX

Option C is the correct choice

Explanation:

The major contributor of green house effect are

a) Carbon dioxide (CO2)

b) Carbon Mono-oxide (CO)

c) Nitrous oxide

d) Methane

e) Ozone

The chlorofluorocarbons (CFCs) is a man made green house gas and hence the chemist will not model it as it does not allow to absorb heat. Instead it leads to non ending chain reactions with the ozone layer thereby degrading it and hence allow entry of harmful UV rays.

Option C is the correct choice