. When a couple are both carriers of a recessive allele for a genetic disease, what will be the probability that they will have a child with the disease?
a) 0%
b) 20%
c) 25%
d) 100%

satellites are frequently used to make observations of the orbit on earth

not sure if this is what you'r looking for eubacteria and archaebacteria

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .