Answer:
Option B
Explanation:
A plate breaking when falling to the floor would be a physical change, not chemical, as what the plate is created from would not change.
An icicle melting in the sun would be a physical change, as an icicle is frozen water, and after melting it would be normal water.
A can being crushed is still just a physical change, as the material making the can(typically aluminum) has not changed.
When a jet airplane starts its engines, fuel is combusted, creating energy for the engines to start. This would create the loud noise. As fuel is combusted, it turns into different things, henceforth the sound would imply a chemical change has occurred.
Double helix.
The double helix is shaped like a twisted ladder, the double helix is a description of the molecular shape of a double stranded DNA molecule.
One chromosome has two strands of of DNA in a double helix.
Samoset and Squanto both speak using the English language.
Answer: B. Blood would leak backwards through the damaged valves due to gravity, causing lower leg swelling.
Explanation:
The human heart consists of four chambers that are two atria and two ventricles. The valves helps in the unidirectional flow of blood from the upper chambers to the lower chambers. They prevent the backward flow of blood. There are four heart valves :
1. tricuspid valve: it lies between the right atrium and right ventricles.
2. mitral valve: it lies between the left atrium and the left ventricle.
3. pulmonary valve: it lies between the right ventricles and the pulmonary artery.
4. aortic valve: it lies between the left ventricle and the aorta.
According to the given situation if the valve get damaged Blood would leak backwards through the damaged valves due to gravity, causing lower leg swelling is the relevant option.