The sun appears to cross the plane of Earth's equator
when it reaches either one of the "equinox" points in the sky.
Answer:
Carbon Dioxide
Explanation:
During cellular respiration, glucose and oxygen are converted into carbon dioxide.
There is external and internal so I'll list th external. The most important is skin then mucus, sweat or secretion, hair, nails and tears which are all part of the integumentary. Some internal defenses are white blood cells and T cells.
Chemical bond is the right awnser
