Combining the work of other scientists with their own research, Watson and Crick discovered that two strands of DNA join together to form a(n)

What type of bonds link individual amino acids together?

What vitamin gives carrots and sweet potatoes their orange color?

Why does competiton happen? a: different organisms have different needsb: there are limited resources in an ecosystemc: there are no predators in an ecosystemd: organisms do not need the same resources (i think it's b but i'm not sure)