The sugar pill serves as a control.
The control in experiments is a sample that remains the same throughout the experiment and it is used to compare the results of the main experiment to. It serves to guarantee that changes noted in the experiment are from the variables introduced and not something else.
Nucleosynthesis is the answer
Answer:
They are different species
Explanation:
Could be that they look similar or that they can share similar environmental portions of land. But, if one specie has more land to colonized and do not do it, that mean that the environmental conditions are not the ideal for it like it is mention the climate (maybe hotter or cooler) or soil (it has a different pH, is lack of one esential nutrient, etc. )
.Answer:
Option A, fix nitrogen inside nodules on the roots of legumes
Explanation:
Rizhobium bacteria live in symbiotic relationship with roots of leguminous plants such as pulses including alfalfa, soybean etc.
Rhizobium or Bradyrhizobium is a gram negative bacteria that satisfies the nitrogen starvation of host plant.
These bacteria get habitation and nutrition from these leguminous plants and in return they fix the nitrogen into the nodules of the roots. This is a kind of facultative association between soil bacteria rizhobium and legume plants.
Hence, option A is correct
Thus, option A is correct
