Which two substances bind using a lock and key mechanism?

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

The response is the basis for vaccination. primary secondary tertiary none of the above

How are the reproductive cycles of a fungus and a pteridophyte similar? a)both organisms form fruiting bodies that produce diploid seeds. b)both organisms produce haploid spores and exhibit diploid and haploid stages. c)both organisms reproduce sexually when two haploid hyphae fuse. d)both organisms exhibit a diploid stage and are only able to reproduce asexually.