Answer:
The first heart sound (S1) represents closure of the atrioventricular (mitral and tricuspid) valves as the ventricular pressures exceed atrial pressures at the beginning of systole (point a). S1 is normally a single sound because mitral and tricuspid valve closure occurs almost simultaneously.
Explanation:
Warm Front would be your answer
Answer: it helps with the liver, your kidneys and lungs
Explanation: The excretory system is a passive biological system that removes excess, unnecessary materials from the body fluids of an organism, so as to help maintain internal chemical homeostasis and prevent damage to the body. The dual function of excretory systems is the elimination of the waste products of metabolism and to drain the body of used up and broken down components in a liquid and gaseous state. In humans and other amniotes (mammals, birds and reptiles) most of these substances leave the body as urine and to some degree exhalation, mammals also expel them through sweating.
<span>Answer: 16, 1, 1
The average ratio of omega-6: omega-3 in American people would be from 1:16 to 1:25, while the average of others people around 1:4. It is much more than the recommended ratio which is 1:1
Omega-3 should be found more in fish while omega-6 is more common in nuts and seeds.</span>
Homologous structures are organisms which are grouped according to phylogeny, reveal that closely related organisms have more similar structures for example whales were once classified as a fish because they live in the water and they have flippers. Flippers are homologous to human arms and legs and they are therefore closely related to human beings.
Similar embryological development. Embryos of various vertebrates all look similar, including features. For example, tails which are not seen in the maturity suggests that all organisms evolved from a common ancestor, still, we express and share genes that are shared and belie ancestry.
Shared biochemical molecules such as DNA and ATP structure of molecules reflect descent with modification. The evidence of universal common ancestor is being reflected in the universality of DNA as a genetic material.
The genetic code in the machinery of DNA expression and replication. The relatedness within groups of organisms is reflected in the similarity in their DNA sequences. This is the exact pattern to be expected from diversification and descent from a common ancestor.
