Covalent bonds are formed between metals and boiling points true or false

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

Aresearcher has developed two stains for use with seed plants. one stains sporophyte tissue blue; the other stains gametophyte tissue red. if the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur? a) the pollen grains will be pure red. b) the pollen grains will be pure blue. c) the pollen grains will have red interiors and blue exteriors. d) the pollen grains will have blue interiors and red exteriors.

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?