Answer: Made up of
Explanation:
Composed can mean several things such as being able to remain calm or being made up of something. In this case it is the latter. When they say that something is composed of something else, it means that the first thing is made up of the second thing.
In this case therefore, the oceanic crust being composed of pieces that cover the ocean floor means that the oceanic crust is made up of those pieces.
A neutron is one of the three subatomic particles, between electrons and protons it has no charge since it is neutral.
During photosynthesis, with the aid of light energy, plants produce food from carbon dioxide and water. The energy produced by the plants is first consumed by the plants to do the process and then consumed by the primary consumers to the secondary, third, until to the decomposers. There is an energy loss in the food chain as energy is used by the consumers for activities before they are consumed by another organisms
The first known ancestors of frogs were about 250,000,000 years ago
