Answer:
Sample 1
Explanation:
Dna contains carbon, hydrogen, oxygen, nitrogen, and phosphorus. These make up the sugar-phosphate backbone of the DNA also known as the sides of the ladder.
Answer:
Cell wall
only plant cells contain a cell wall
Answer:
3 is appropriate statement that describes photosynthesis
Bird vocalization is often a mating behavior; however, bird vocalization can be used to warn other birds if danger is nearby, or for other means of communication.