Answer:
18:repeat the experiment again
Explanation:
Because repeating the experiment would get rid of inaccurate data
I'm thinking it's D, They have homologous chromosomes.
For the Hydrosphere, drag Pond and lake.
For the Atmosphere, drag gaseous nitrogen.
For biosphere, drag Mountain Range, micrograms, and coastal vegetation.
I don’t know about the Geosphere (sorry)