Cells, Water, and Chemicals Flashcards
natural selection
traits that lead to better reproduction and survival continue while others die out
cells
complex machine that survives and builds more similar machines
diffusion
moves things over short distances from region of high to low concentration
covalent bonds
formed by sharing electrons between 2 atoms
hydrogen bonds
electrical attraction between the positively and negatively charged ends
adhesion
polar water molecules are electrically attracted to polar and charged molecules
solvent (water property)
binds, suspends, hydrophilic
cohesion
polar water binds to polar water
high specific heat of water
requires a higher heat input to increase temperature than many other sources
what do fossil records show about evolution?
fossils show that species have vanished but new species have emerged; make it clear evolution happened slowly
what causes polar covalent bonds?
differences in electronegativity cause unequal sharing
how does the density of liquid water compare to ice?
ice is less dense due to greater spacing which allows ice to float