Answer:
The hardness rating is 4.
Explanation:
Calcite sits at a hardness rating of 3 and is very easily scratched with a knife and/copper coin. This is where most Marbles, limestones, travertines, rate.
Meanwhile, Fluorite sits at hardness 4 and can be scratched by a knife.
Mitochondria are found in plant cells...? I'm not too sure.
Answer:
D. Animal cells would not have the materials needed to produce energy in cellular respiration.
Explanation:
The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period.
What is internal and external stimulus? What is an example of each?
Answer:
A internal is situated or existing in the interior of something Example:No country should interfere in another country's internal<span>
affairsAnswer:
A external stimulus </span><span>
is a detectable change in the internal or </span>
external environment. Example: When a person sees a burger when hungry they s<span>
tomach starts to growl</span>