When do feedback loops fail to work on an ecosystem?

Which of the following statements is true? a. there are more chromosomes in an organism than there are genes. b. there are more genes in an organism that there are chemical bases. c. dna is made of sugar, phosphate, and carbon. d. genes are found in specific locations on a chromosome.

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

How can you tell the difference between rough er from smooth er?