Cyanobacteria are the major force of the Great Oxygenation Event around 2.35 billion years ago. The organisms that evolved photosynthesis changed the composition of the atmosphere to mainly oxygen. This changed the dynamic of life on earth by allowing organisms to also exist on land. This is because it was possible for ozone to form and reduce the lethal UV rays from the sun reaching the earth's surface to destroy genetic material.
Answer:
Nucleus
Explanation:
The nucleus of an atom is the central part that is made up of the protons and neutrons of the atom. It is also what makes up most of the mass of an atom. Electrons are those ones found in the orbit of of the atom (the little blue balls). They also have mass, but it is so small that it is negligible.
The nurse is demonstrating the process of taking vital signs, then the students practice taking vital signs. This is observational learning.
Answer:
Volume is the amount of space occupied by a sample of matter. The volume of a regular object can be calculated by multiplying its length by its width by its height. Since each of those is a linear measurement, we say that units of volume are derived from units of length.
Explanation: