Take a chisel and a hemmer to carefully carve around the fossil to not damage it. then they study it
Answer:
D
They occur in the thylakoid membranes of the chloroplast.
Answer: S
Explanation: In the eukaryotic cell cycle, chromosome duplication occurs during "S phase" (the phase of DNA synthesis) and chromosome segregation occurs during "M phase" (the mitosis phase).
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.
Scientist believe that the Big Bang formed the Earth and all the other planets in the universe.