Make a conceptual model of the carbon cycle using the following components: Producers (plants, algae, some bacteria), Non-Producers (animals, fungi, protists, the rest of the bacteria),
and the Atmosphere. Also include the processes of photosynthesis (P) and cell respiration (R).

The meselson-stahl experiment demonstrated that dna replication is semiconservative. in the figure, semiconservative replication is illustrated by

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.

Crossing over is a method of (blank)?