Why do you think it is important to replace old or damaged cells?

Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what

Which of these is not a nucleotide base found in dna?

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid