Which of the following is the first major event in animal development?Multiple choice question.OrganogenesisGastrulationFertilizationCleavage

Which occurs during embryonic development immediately after fertilization?Multiple choice question.MorphogenesisGrowthDifferentiationCleavage

Multiple Choice QuestionIn terrestrial animals, the last step of fertilization is the Blank______.Multiple choice question.fusion of nucleicleavageblastulationegg activation

From earliest to latest, the correct sequence in early development proceeds as follows:a) fertilisation – cleavage – gastrulationb) cleavage – ovulation – organogenesisc) gastrulation – cleavage – morulad) cleavage – organogenesis – gastrulation

The division of the animal body into repeated parts is calledMultiple choice question.protostome development.deuterostome development.gastrulation.segmentation.

In bilaterally symmetrical animals, the mouth forms first in animals with ______ embryonic development, and the anus forms first in animals with ______ embryonic development.Multiple choice question.protostome; deuterostomechelicerate; mandibulatemandibulate; cheliceratedeuterostome; protostome