NATS 1675 Lecture Notes - Lecture 5: Dorsal Nerve Cord, Stereopsis, Binocular Vision

• School: York University
• Department: Natural Science
• Course: NATS 1675
• Professor: Robert Crippen

Document Summary

Cell mates (cid:862)ma(cid:396)(cid:396)iage of (cid:272)o(cid:374)(cid:448)e(cid:374)ie(cid:374)(cid:272)e(cid:863) (cid:271)et(cid:449)ee(cid:374) so(cid:373)e p(cid:396)oka(cid:396)yoti(cid:272) (cid:272)ells a(cid:374)d euka(cid:396)yoti(cid:272) (cid:272)ells. Symbiosis- is association between members of 2 or more species. Mutualism- one of 5 types of symbiosis, type of symbiosis that is beneficial to both species. Mitochondria and plastids capable of making dna without nucleus (only organelles) Evidence suggests that eukaryotes evolved from prokaryotes or at least from a common ancestor. Bipedal posture- (walking on 2 feet) is an important anatomical feature used to determine if a fossil is hominin (human) 5-6 million years ago there was a profound cooling period (climate changes in different places depending on climate) All are heterotrophs (get nutrients from many sources); characteristically ingest food, i. e. , they eat the tissues of other. Hollow dorsal nerve cord & notochord (lengthwise supporting rod located on dorsal side. Usually give live-birth (developing embryo usually retained in a uterus)