I believe its lack of worthy projects, but ill tell you if im wrong.
All of the above except "formed from the remains of dead plants."
Metamorphic rock is formed by heat and pressure from any type of rock (igneous or sesimentary) and is part of the rock cycle.
The main difference in the process of waste removal between unicellular and multicellular organisms is the fact that unicellular organisms rely on only their membrane and organelles, the whole process is in inside the cytoplasm of the cell and once waste is formed, it is "packed" in special sacs called vacuoles and then, through the process of exocytosis they are being left out of the cell. On the other hand, multicellular organisms most often have specific organs that are in charge of the process of digestion, absorption and excretion or removal of waste.
When the star expands the temperature of the star will decrease do to the greater surface area of the star itself.
Throughout the revolution of Earth, it has affected us in many ways. One of the affections and
