D. Provision of fresh water is a direct value of biodiversity.
Direct values of biodiversity refer to biological resources that give immediate satisfaction or enjoyment.
Two types of direct values of biodiversity are Consumptive use and productive use.
Fresh water is consumptive use. It is a direct value because we can access fresh water immediate from nature without it going through the market. Other examples of direct value for consumptive use are firewood, fodder and meat.
The correct options are as follows:
1. Human skin color variation is primarily determined by the type and amount of melanin pigment in the skin.
2. Human skin color variation likely evolved in response to differences in the intensity of sunlight around the world.
3. Human skin color evolve recently in hominid evolution, once some population of human ancestor migrated out of Africa.
The color of human skin is primarily determine by melanin. The intensity of the sun in the climate where one is living also affect the type of skin color that will dominate in a geographical area.
Answer:
D. It is a random guess about how something happened.
Explanation:
In everyday life, a theory is a hunch or a guess about how something happens (in the scientific method, we might call it a <em>hypothesis</em>).
A is <em>wrong</em>. It doesn’t necessarily explain how nature works, because it hasn’t been tested by experimental testing and observation.
B and C are <em>wrong</em>. They are features of the <em>scientific method</em>.
C. shields i think is the right answer
