Which heat transfer mechanism requires molecules to actually touch each other? radiation, conduction ,convection ,none of these

Option (b) is the correct answer.

Explanation:

This process is known as conduction.

For example, a metal spoon placed in hot coffee cup then heat will flow from coffee to the cup.

For example, boiling water represents convection process.

For example, heating of a metal plate placed in the sunlight.

Thus, we can conclude that conduction is the heat transfer mechanism which requires molecules to actually touch each other.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.