BIOL 1010 Lecture Notes - Lecture 52: Krill, Natural Selection, Pupa
14 May 2017
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Only 2 pairs of short legs per body segment. terrestrial creatures. Centipedes are terrestrial carnivores with poisonous claws used in defence & to paralyze prey (cockroaches & prey). Each body segment bear single pair of long legs. Nearly aquatic. (lobsters , crayfish, crabs, & fish) Barnacles with cuticle that is hardened into shell containing calcium carbonate. Jointed appendages project from shell to strain food from water. Copepods & krill serve as food sources for fish & whales. Section 20. 12 insects are the most successful group of animals. Similar to arthropods body segmentation, exoskeleton, & jointed appendages. Natural selection acts rapidly, & alleles offer reproductive advantage can be quickly established in population. Metamorphosis animal takes on different body forms as it develops. 80% undergo this process: the larval stage is specialized for eating & growing. Incomplete metamorphosis transition from larva to adult achieved throughout multiple moults, without forming pupa.
