Which of the following correctly completes the following equation:

nitrogenous base + sugar + phosphate group = ?

nucleotide

amino acid

enzyme

antibody

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above

the answer is d p: cell, q: organ, r: organ system, s: tissue