Answer:
A. Aorta
B. Pulmonary Artery
C. Pulmonary vein
D. Left atrium
E. Mitral valve
F. Lift ventricle
G. Right ventricle
H. Tricuspid valve
I. Inferior vena cava
J. Right atrium
K. Pulmonic valve
L. Superior vena cava
Explanation:
Aorta is big artery which takes blood from the heart and gives it to all body. Pulmonary artery carries deoxygenated blood from the heart to the lungs while pulmonary vein carries oxygenated blood from the lungs to the heart. Mitral and tricuspid valves prevent the backward flow of blood in the heart. Superior and inferior vena cava is a big vein which collects deoxygenated blood from all body.
<span>For an organism having an eight-cell embryo, the cells of the upper tier were aligned over the cells of the lower tier at a very slight angle. Given these conditions, it can be concluded that the organism is likely to be a sea cucumber. The growth of the sea cucumbers starts with the development of the larvae. </span>
Answer:
The correct answer is "Charles Darwin and Alfred Russel Wallace".
Explanation:
Charles Darwin and Alfred Russel Wallace are two of the most prominent scientists regarding evolutionary biology. In 1859, the famous book "The origin of the species" by Charles Darwin explained that species develop new traits along several generations, where the traits that are advantageous for the species remain. Alfred Russel Wallace, as well as Charles Darwin, was a naturalist that performed many research expeditions. These two men shared many letters and both concluded that variation of traits might provide better odds of survival in certain environments, where natural selection works as a selector of traits.
The answer should be D. Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.
