Workbook Lab Manual T - baabuu.de
You're currently on {{currently_on}}. However, it looks like you listened to {{listened_to}} on {{device_name}} {{time}}.Animals are eukaryotic , multicellular organisms that form the biological kingdom Animalia . With few exceptions,

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Animals are eukaryotic , multicellular organisms that form the biological kingdom Animalia . With few exceptions, animals are motile (able to move), heterotrophic (consume organic material), reproduce sexually , and their embryonic development includes a blastula stage. The body plan of the animal derives from this blastula, differentiating specialized tissues and organs as it develops; this plan eventually becomes fixed, although some undergo metamorphosis at some stage in their lives.

Animals are divided by body plan into vertebrates and invertebrates . Vertebrates—fishes, amphibians , reptiles, birds, and mammals —have a vertebral column (spine); invertebrates do not. All vertebrates and most invertebrates are bilaterally symmetrical ( Bilateria ). Invertebrates include arthropods , molluscs , roundworms , ringed worms , flatworms , and other phyla in Ecdysozoa and Spiralia . Echinoderm larvae are initially bilaterally symmetrical, but later as adults develop radial symmetry; Cnidarians are radially symmetrical ; ctenophores are biradially symmetrical ; and sponges have no symmetry.

Animal phyla appeared in the fossil record as marine species during the Cambrian explosion , about 542 million years ago. Animals emerged as a clade within Apoikozoa as the sister group to the choanoflagellates .

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