Why are nitrogen-fixing bacteria important in ecosystems?

Which of the following would be least likely to support the modern concept of biological evolution? ( 2 points) a)different species of organisms with similar bone patterns b)different species of organisms with similar reproductive rates species in c)different domains with similar metabolic pathways species in d)different kingdoms with similar cellular structures.

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

Name the glands associated with human digestive system