I think the answer is b not too sure though
Carbon dioxide is a byproduct of respiration while oxygen is a byproduct of photosynthesis.
Remember that a byproduct is a secondary product that is made in the synthesis of another. It is unintended and excreted.
Answer:
Human, nervous system, nerve tissue, neurons.
Explanation:
The organism is the biggest, in this case is a human, a human is composed of systems, and then organ tissue, and organ tissue is made out of cells.
They are created by the physical/chemical alteration by heat and pressure of an existing igneous or sedimentary material into a more denser form. (In other words, they are igneous or sedimentary rocks that have undergone changes as a result of extreme pressure and heat.)
