Bacteria, archaea, fungi, algae
Answer:
Carbohydrates, proteins, and nucleic acids are built from small molecular units. The small molecular units are called monomers
Explanation:
I'm not really sure if that was what you were looking for, but I remember learning this in biology. I'm sorry if this doesn't help.
One type of atom, such as hydrogen is called an element. An element is a pure substance, made up of only one type of atom. You can find the elements on the periodic table of elements, where they are listed.
Answer:
Higher oxygen levels means animals can grow larger and still maintain the supply of oxygen to their muscles. Falkowski and colleagues calculated fluctuations in the atmosphere's oxygen levels from cores of deep-sea rocks dating back 205 million years.
