This is 7th grade hon science

What is the compliment dna strand to the following sequence: ttgactaggcta

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

Describe the relationship and movement between temperature and density in a convection cell. make sure you identify the direction of travel