I'm doing a portfolio on " The human impact issues in south Carolina" and one of the questions is " How has the population in South Carolina changed over the last 20 years?" I don't understand how I would word that

Which prevent errors in dna replication? a. helicase enzyme checks the dna for errors. b. each base can attach to only one other type of base. c. ribosome enzymes prevent errors from happening. d. dna contains no complementary base pairs.

As , plants meet their needs for making food from air, soil, water, and the sun's energy in a process called there are plants called grow high in trees without here are words to put in the blanks. 1.) producers 2.) consumers 3.) chloroplasts 4.) epiphytes

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine