What did Animals evolve from?
Heterotrophic, aquatic, animal-like protists
How do Animals obtain food?
Sexual? Asexual Reproduction?
Both; most are sexual
Most have movement; some are sessile
Animals grouped into phyla based upon fossil comparisons, body symmetry, pattern of embryonic development and ribosomal RNA and other macromolecules
Sea anemones and jellyfish
clams, squids, snails
union of female and male gametes to form a zygote. (1n+1n= 2N)
A series of mitotic evolutions that increase in number but not in size.
A hollow ball of cells
Specialization of cells
tissue layer in embryo that give rise to tissues and organs
Cells, tissues, organs, organ systems,organism
inward movement of cells at one end of blastula
Germ layer that makes skin
makes many organs
inner germ layer that becomes urinary and repro organs
Embryos of mollusks, arthropods and annelids
Embryos of echinoderms and chordates
False body cavity. body cavity not completely lined with mesoderms
no body cavity
Asexual:budding, gemmules and regeneration
Sexual: Sperm enters through pores, and choanocytes engulf sperm and transfer it to amoebocytes