Answer:
The investigator needs to add a negative and a positive control. The positive control can be an auxin previously tested on this plant species, and the negative control should be a NON AUXIN SPRAYED plant, it can be sprayed with disstilled water. It is importan that all these plants are exactly under the same conditions (temperature, light, etc.), but with a distance between them that does not allow crossed contamination.
Explanation:
Answer:
C
Explanation:
Even when sharks and tigers are both meat eaters, the question is about similarities between tigers and crocodiles, so D is out. A is about crocodiles and sharks, so it's out also. B suits for sharks too, so it's out too. C is the most suitable answer, because both animals have four legs, which means that they belong to the group of quadrupede animals.
