Answer:
A adaptation is the action or process of adapting or being adapted
Explanation:
is mostly when a animal is adapted to something.
The heart must beat faster during exersise because by increasing the heart rate the body is able to increase cardiac output and deliver the necessary blood flow to the mucles
D oxygen there was no free oxygen on the earth
Calcite occurs in igneous, metamorphic, and sedimentary rocks and is the most commonly encountered carbonate mineral.
The answer is C. its easy just study Don't Look for answers
