BIOL-K - Biology BIOL-K 103 Lecture Notes - Lecture 3: Starfish, Fluid Balance, Buoyancy
28 Jan 2017
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Adaptations for feeding, reproduction, waste removal, etc. Cell division (cleavage) leads to blastula (hollow ball of cells) More subtle differences between young and adult. Ex// grasshopper nymphs going from no wings to developing. Adaptations to habitats: ocean (marine), fresh-water, land. Isoosmotic body fluids ( roughly about same osmotic concentration as water) Combo of both fresh and saltwater problems. Significant salinity changes as move toward saltwater area. No longer have problems faced in water. Drying out of gametes and developing offspring (internal fertilization and shelled egg) Skeletal system and muscles support weight and movement. Body fluids hypertonic to water (requires osmoregulation) Generally less than in seas or oceans. Must maintain body temperature over wide variation in temps (includes physiological and behavioral adaptations) Comparisons at molecular level (proteins, dna, rna) Multiple planes thru central axis produces two similar. Single plane (midsagittal) produces similar right and left halves. Divides body into right and left parts. Divides body into dorsal and ventral parts.
