Arrange these stages that form during the first week of human development according to the order in which they occur. Place the earliest stage at the top.InstructionsDrag and drop application.Choice 1 of 4. Embryo toggle buttonEmbryoChoice 2 of 4. Zygote toggle buttonZygoteChoice 3 of 4. Blastocyst toggle buttonBlastocystChoice 4 of 4. Morula toggle buttonMorulaNeed help? Review these concept resources.

Match the following stages of human development with the best description.InstructionsDrag and drop application.Embryonic periodEmbryonic period drop zone empty.Fetal periodFetal period drop zone empty.Pre-embryonic periodPre-embryonic period drop zone empty.Weeks 2-8; implantation occurs; nervous system, limb buds and all other systems are developing.Egg is fertilized by sperm; zygote begins to divide.Third - ninth month; organ systems complete development.

List the following events of oogenesis and fertilization, assuming fertilization does occur, in the correct sequence beginning with the first event to occur at the top.InstructionsDrag and drop application.Choice 1 of 4. Haploid cells, including secondary oocyte and polar body, form. toggle buttonHaploid cells, including secondary oocyte and polar body, form.Choice 2 of 4. Primary oocyte undergoes meiosis I. toggle buttonPrimary oocyte undergoes meiosis I.Choice 3 of 4. Completion of meiosis II occurs. toggle buttonCompletion of meiosis II occurs.Choice 4 of 4. Fertilization occurs. toggle buttonFertilization occurs.Need help? Review these concept resources.

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

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Click and drag on elements in orderThis list identifies the various levels of structural hierarchy in the body. Rearrange the list in order of complexity, so that the least complex level is at the top and the most complex level is at the bottom.InstructionsDrag and drop application.Choice 1 of 6. Tissue toggle buttonTissueChoice 2 of 6. Cell toggle buttonCellChoice 3 of 6. Organ toggle buttonOrganChoice 4 of 6. Organism toggle buttonOrganismChoice 5 of 6. Atom toggle buttonAtomChoice 6 of 6. Organ system toggle buttonOrgan systemNeed help? Review these concept resources.