Eukaryotes are organisms whose cells have a nucleus enclosed within membranes, unlike prokaryotes. Eukaryotes belong to the domain Eukaryota or Eukarya.
The heart receives its blood supply from the coronary arteries. The two main coronary arteries branch off the trunk of aorta close to the aortic va;ve. Coronary arteries receives blood from aorta during diastole when ventricles are resting. Right coronary artery extends to the right and perfuses the right atrium and right ventricle. The SA node is perfused by RCA in approximately 55% and AV node supplied by RCA in 90% of populatio. The remaining percent is supplied by left circumflex.
Because we would die without oxygen
Answer:
The correct answers are statements a and b.
Explanation:
The clusters of cells can exhibit the capability of evolution if it fits into three conditions, that is, possessing the tendency of reproducing, variation in clusters and that variation need to be hereditary, and the clusters shall pass fitness, that is, clusters must be abundant in comparison to the single cells.
The given first statement indicates that clusters possess the tendency to reproduce by the process of fragmentation. Thus, it supports the hypothesis that the clusters possess the tendency to evolve. The second statement indicates that clusters are more fit, therefore, it also supports the hypothesis.
The third statement is contrary to the hypothesis. Therefore, it does not support the hypothesis. The fourth statement is in contrast to fitness, more abundancy shows more fitness. Therefore, it also does not support the hypothesis. Hence, the correct statements are a and b.
