Answer:
Please see below
Explanation:
It doesn't change much because as opposed to other mineral cycles, phosphorus does not have a gas compound and thus there is not a significant storage of phosphorus in the atmosphere. Under such scenario, whatever phosphorus can be found in the atmosphere such as windborne soil particles or pollen grains becomes important. A third component that needs to be mentioned is the ocean. River runoff is the main source of phosphorus input to the ocean from which phytoplankton incorporates it into the food chain.
This would be a legato. Which is referred to as a playing melody in a smooth connected style :)
If food is not equally distributed, some groups will receive more than others. For example, food is very poorly distributed across the world. Countries like the U.S. have a surplus of food while poor nations in Sub-Saharan Africa often don't have access to enough. A group may have so little access to food that they fall into a famine.
Drought and flooding can destroy agriculture. A drought is a lack of rain that will not allow crops to grow and will cause animals to die. A flood can also be disastrous by submerging fields, drowning livestock, and destroying infrastructure. When livestock and crops die, a famine will occur.
An increase in population just means more mouths to feed! The more people there are, the more food needs to be produced. If food production cannot keep up, a famine can occur.
Answer is (a) human adaptability.
Rationale for rejecting b,c,d options:
Humans do not have a high fecundity, they can give birth to 1-3 offspring on an average.
The skin tone variation is an adaptation that is based on the geography. The sunlight intensity affects it. It is a part of the ability of the humans to efficiently adapt to their surroundings.
The body variation in the form of physical features is also the result of the ability of the humans to adapt to their surroundings.