Answer: D
Explanation: over the courses of time, we discover more and more explanations for causes of chemical reactions, biology, etc.
What viral disease now thought to only exist inside a laboratory caused the death of many American Indians after europeans arrived in north American?
smallpox
Answer: Each indivdual has there own genes so the each will have different traits.
Explanation:
1. Rock is buried deep under Earths surface. 2. Rock melts due to high temperature. 3. Magma is forced out of Earth's surface during volcanic eruption. 4. Magma cools and crystallizes. Rock from underneath the ground has to heat up and be pressurized first. After enough pressure and heat are applied the volcano will erupt. Extrusive igneous rocks are formed when lava cools on Earth's surface above ground.
The answer is letter A.
<span>
The skeletal, cardiac, and smooth muscles are the different muscles that
make the human body. They are responsible for moving the body internally and
externally. Movements of the muscles are classified as being voluntary or
involuntary. Both cardiac and smooth muscles are involuntary muscles that
contract without the need for conscious thought. These are found in the heart
and organs like the intestines responsible for digestion. Skeletal muscles are
called voluntary muscles because they contract upon the brain’s commands or
signals like the muscles of the arms, hands, and feet. </span>