Answer:
Soil is composed of small pieces of a variety of materials, so it is a heterogeneous mixture.
Explanation:
Metals sunk to the centers a long time ago when the interiors were molten throughout
Answer:
(D) is composed of widely dispersed populations.
Explanation:
A polytypic species is the one that is composed of various local populations. These local populations differ from each other with respect to one or more genetic traits. Each of the local populations that make a polytypic species exhibit genetic variations among its individuals.
For example, individuals from the local population of human exhibit variations for genetic traits such as skin color, hair color, etc.
Answer:
Mass
Explanation:
The measure of the pull of gravity on an object is called weight. For an object to have weight it must have mass.
<h2>Darwin's theory of evolution</h2>
Explanation:
When Charles Darwin considered some of the unique structures found in modern animals, like the feathered wings of birds, he famously proposed that modern animals must have evolved from earlier forms that lacked those structures. He also predicted that there must have been some intermediate structure between them which may be found in fossils.
Evolution is the process by which certain traits develop within an population, become fixed and make the population's survival more efficient. According to theories of evolution the modern day species were not the same million years ago but they gradually got modified with time and so they differ significantly from their ancestors.