| A | B |
|---|
| biomes | massive subdivisions of the biosphere that are classified by the climate and plant life examples are the rain forest, tundra, tiaga and grassland |
| biosphere | name given to the entire living ares of earth |
| blastula | ball shaped collection of embryonic cells consisting of about 128 cells |
| body cavity | refers to the inner space within some animals where internal organs develop. animals with a body cavitiy are called coelomates |
| bone marrow | flexible tissue within bones where blood cells are produced |
| bulk flow | any kind of one way movement of fluids caused by differences in pressure |
| bryophytes | group of plants that lack true stems, roots and leaves includes mosses and liverworts |
| bowman's capsule | structure within the nephron of the kidney where blood firsts enters the nephron. it captures the waste in the filtrate |
| biodiversity reduction | consequence of negative human activity. Results in the extinction of plants and animals due to habitat loss |
| bacillariophyta | group of protists that contains diatoms. diatoms are photosynthesic marine organisms that have silica in their cell wall |
| barr body | in females with two x chromosomes one is functional the other is condensed and non functional |
| base substitution | type of genetic mutation that occurs when one nitrogenous base is substituted for another |
| beta cell | type of cells in the pancreas that produce insulin |
| bilateral symmetry | form of animal body tath cotains a head and tail , left and right and dorsal and ventral side |
| binomial classification | system of naming organisms developed by Linnaeus. each organism contains a genus and species |
