Answer:
Rosalind Franklin made an X-ray image of the DNA molecule, that has revealed the following:
1. The nitrogenous bases are near the center of the DNA molecule
2. DNA molecule is composed out of two strands
3. DNA molecule has the shape of a helix
Watson and Crick made the first model of the DNA molecule based on that very picture. They concluded that the strands are antiparallel and that they are composed of nucleotides.
Explanation:
Biological Magnification:
The accumulation of chemicals in the top most organism of the trophic level or food chain.
Example : sharks , predator fishes etc
Answer:
blood
Explanation:
Contractions of the myocardium pump blood through the circulatory system.
Answer:
Circulatory and excretory
Explanation:
Excretory removes waste products and toxins from the blood using the kidneys. The kidneys filter the blood and return the essential products (water, salt, sugar, etc) back to the bloodstream in normal amounts after removing the wastes. The circulatory system provides the kidneys with oxygen, allowing the organ to live and to do its job.
Answer:
the the animal chane doesnt get mixed up with other anmal
Explanation:
