Answer:
Option C. is correct.
Explanation:
According to Chargaff's rules, DNA (Deoxyribonucleic Acid) from any species of an organism should have purine and pyrimidine bases in the ratio 
This ratio is very important for solving the structure of DNA.
As per this rule, DNA is double-stranded, and covalent bonds between identical nucleotides hold the strands together.
So, Option C. is correct.
Answer:
1) The angle that Earth is tilted on its axis changes.
Explanation:
Surface of earth received more sunlight due to the tilting of the earth toward sun. Tilting is the property of the earth in which earth rotate its one end toward the sun. This tilting of earth is responsible for the formation of seasons on the earth. Earth tilt about 23.5 degrees toward sun. If there is no tilting occurs, no seasons will be formed.
Answer:
Answer is C, the creature's body is bilaterally symmetrical.
Explanation:
Note that , when an organism is said to be bilaterally symmetrical, it means that , the right side and the left side of the body plan are just like mirror image of each other, when cut or divided along a plane.
In this case, since the scientist just found a new life form, the type of symmetry possess by the organism is never to be considered essential, because if it were to be considered, it will mean the new organism will be terminated or killed to confirm the symmetry, which has automatically negate the process of determining whether the new life form is alive.
