An egg is protected by its outer shell. However, the shell also allows moisture and air to pass through. Which cell structure performs a similar function? A. cell membrane B. cytoplasm C. nucleus D. vacuole

Based on the results of this study, what questions remain unanswered? how can these questions guide future research

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

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?