If a dna double helix is 100 nucleotides long and contains 15 adenine bases, how many guanine bases does it contain?

Which element provides strength to the exoskeleton of clams and oysters

An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen

How does the nervous system affect the excretory system?