if a total solar eclipse occurs during a new moon phase and a total moon phase, why do we not observe one solar eclipse and one lunar eclipse per month?

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

Which of the following statements is true? a. there are more chromosomes in an organism than there are genes. b. there are more genes in an organism that there are chemical bases. c. dna is made of sugar, phosphate, and carbon. d. genes are found in specific locations on a chromosome.

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast