Discuss the importance of fossil records in identifying the level of evolution took place in the planet earth

Fossils are important evidence for evolution because they show that life on earth was once different from life found on earth today. Paleontologists can determine the age of fossils using methods like radio metric dating and categorize them to determine the evolutionary relationships between organisms

answer: the answer is b

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.