How do vaccines give immunity to infectious diseases?
a. they kill pathogenic microbes.
b. they produce an immune response.
c. they contain antibodies against pathogens.
d. they inhibit the antigen-antibody reaction.

Whay is the following best defines climate

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.

As the pea seeds respire, the level of coloured liquid in the left hand part of the capillary tube rises. by referring to what is happening in the apparatus, explain why the level of liquid changes