Biogeography shows that all camels
a. came from ancestors that lived in north africa.
b. came from ancestors that lived in north america.
c. came from ancestors that lived in north egypt.
d. evolved from the llama.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.

Currents are caused by temperature and density differences

Which of the following molecules will diffuse most quickly across a lipid bilayer membrane? a. h2o b. o2 c. h2po4 d. glucose e. na+