!! 4. Within aquatic biomes, there are many different
environments where different types of organisms
thrive. Phytoplankton, seaweed and other organisms
that perform photosynthesis live in the ocean waters
near the surface, but not in the deepest ocean waters.
Which statement about surface water is most useful
for explaining this observation? (17.2)
a. Only surface water is warm enough for
photosynthesis
b. Only surface water has sufficiently low salinity for photosynthesis
c. Only surface water has dissolved oxygen needed for photosynthesis
d. Only surface water has received enough sunlight for photosynthesis

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.