Which of the following chemical equations represents photosynthesis?
a. carbon dioxide plus water yields glucose (sugar) and oxygen
b. oxygen plus carbon dioxide yields water and glucose
c. glucose plus oxygen yields carbon dioxide and water
d. water plus glucose yields oxygen and carbon dioxide

2points what is the term for a female reproductive cell? a. egg b. chromatid c. allele d. fertilization

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

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.