Question

Question 43 (2 points) Saved Which of the following is most closely related to (i.e. most recently shared a common ancestor with) modern humans? Austrolopithecus Afarensis Homo neanderthalensis O Paranthropus robustus Chimpanzee Question 44 (2 points) Water enters the water vascular system of echinoderms through the: mouth anus madreporite tube feet

Answer 1

Answer 43: The correct answer is Chimpanzee. Chimpanzee is most closely related to modern man Homo sapiens, i.e., most recently shared a common ancestor. An evolutionary chart showing human and chimpanzee divergence from common ancestor is drawn below:

Modern , La human Homo] sapiens Homo erectus Homo habilis Moderno A chimpanzee | Australopithecus afadenses (Ardipithecus ramidus Common ancestor of hominids and - chimpanzee modern human - - Common is by ancestor shared with chimpanzee

Answer 44: The correct answer is madreporite, i.e., water enters the water vascular system of echinoderms through the madreporite. The water vascular system in echinoderms is a system used for locomotion, feeding, excretion, and respiration. It is composed of madreporite, stone canal, radial canals and numerous tube feet. Water enters into madreporite which flows to radial canals via stone canal. During locomotion, water then enters in tube feet from radial canals and contraction of muscles occurs due to which tube feet get extended and push against the ground. Muscles are then relaxed to allow the tube feet to retract. water flow in starfish is shoen below:

Echinoderm water Vascular System a Madreporite Stone canal 0 Radial canal Sensasaris SSS Tube feet szego arceau RRRRRRR azésea Flow of water is :- Madreporute stone canal Radial - Canal Tube feet