If an f1 plant is backcrossed to one of the pure-breeding parental plants, what is the expected ratio of phenotypes among progeny?

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

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