Yy x Yy yields 25%YY 50% Yy and 25% yy which is 1:2:1 (YY:Yy:yy)

The greenhouse effect is a natural process that warms the Earth's surface. When the Sun's energy reaches the Earth's atmosphere, some of it is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases. The absorbed energy warms the atmosphere and the surface of the Earth.
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Krypton is a noble gas and because it has its valence electrons filled, it is very hard for it to react with things.
It is not a halogen as they are extremely reactive.
I believe C.) would be the best answer
An ancient horse was used for labor and was made for carrying heavy loads of water horses are now built with more muscle in their legs