D. Most rocks are a mixture of minerals. They can vary on the types of minerals, like crystals.
Answer:
Explanation:
electrons are a waste product of bacteria living around plant roots – plants discharge organic matter into the soil, which is broken down by bacteria. It is possible to harvest them using motonless electrodes and turn them into electricity, without affecting the plant’s growth in any way.
Muscles are attached to bones; they help us walk and run and smile. All the bones in our body make up our skeleton from the top of our skull to the tips of the phalanges at the end of our toes. Muscles stretch across our bones and are attached with tendons.
Answer:
electromagnetic waves can travel through a vacuum where as mechanical waves have to have a medium to travel
Explanation: