I guess ribosomes are not present in leaf cells
Answer:
is it true or false that new cells arise from pre-existing cells.False
Explanation:
False
Proteins, among the most complex of all organic compounds, are composed of amino acids (see Figure 2-4), which contain carbon, hydrogen, oxygen, and nitrogen atoms. Certain amino acids also have sulfur atoms, phosphorus, or other trace elements such as iron or copper.
The troposphere is the atmospheric layer closest to the planet and contains the largest percentage (around 80%) of the mass of the total atmosphere.
The species of plankton found in sediments and their isotope ratios can show the temperature of the overlying waters when the sediments were deposited.
