Answer:
The difference between a mineral and a rock is (C) A rock is generally made up of an aggregate of minerals, but this is not a requirement. Rocks can also be made up of non-mineral matter.
Explanation:
Answer:
The total amount of water on the planet that is present in the <em>atmosphere</em> at any given time is about 0.001% of the total water found on Earth. This atmospheric water is responsible for all storms.
If by in storage we mean in <em>groundwater</em> then the percentage would be 1.69.
Explanation:
The overwhelming majority of all water on our planet resides in the <em>oceans</em>. These hold about 96.5% of the total.
If we only consider freshwater (water with no salt) then the greatest storage areas are <em>ice caps</em>, <em>glaciers</em>, and <em>groundwater aquifers</em>.
Answer:
The scientists believe that they arose in Africa and spread to the rest of the world.
Explanation:
A is not correct because the Homo sapiens is not the earliest ancestor of moern humans, but it is the latest.
B is not correct because such evidence is lacking, and even though the Homo sapiens mixed with other hominids in Eurasia and sub-Saharan Africa, they were not of the same species.
C is correct because the evidence suggests for now that the Homo sapiens arose in Africa, and through several migration waves spread out on the other continents.
D is not correct because the Homo sapiens has not been replaced by any other species, as they are the species nowadays known as humans.
