Which of the following involve electronic charges?
a. polar molecules
b. ionic bonds
c. hydrogen bonds
d. all of the above

Which represents a negative impact of technology

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?