What animal embryonic structure is an indentation formed during gastrulation, evident in the gastrula stage?Question 9Select one:a.blastoporeb.blastocoelc.neural tubed.gastrula

How do cells of an embryo get inside during gastrulation?Multiple ChoiceCells crawl and change shape.The fertilization envelope punches in the blastopore.Muscle contractions of the uterus punch in the blastopore.Enzymes dissolve a hole in the blastocyst.

Which of the following statements concerning animal gastrulation is correct?Group of answer choicesCells from the blastomere cannot become mesodermal cells.Three germ layers are created; the endoderm, mesoderm and epidermis.The endoderm develops into the gut and lungs.The mesoderm develops into the muscles and nervous system.

Embryonic development begins withMultiple Choicefertilization.the first cell division.the development of the blastocyst.implantation.gastrulation.

Which are true statements about gastrulation?Check All That ApplyIt establishes the basic body plan of the embryo.It establishes the basic body plan of the embryo.Four germ layers arise.Four germ layers arise.Three germ layers arise.Three germ layers arise.The pattern is variable between species.The pattern is variable between species.Yolk is not a major factor in establishing the pattern.Yolk is not a major factor in establishing the pattern.It involves changes in cell shape.It involves changes in cell shape.It involves cell movement.It involves cell movement.

Where does the notochord form in a developing chordate embryo?Multiple choice question.Around segmented blocks of musclesThe dorsal side of the primitive gutBetween the mouth cavity and the esophagusJust beneath the dorsal surface of the animal