T because the earth has some iron but it has a molten core which is mostly iron giving earth its magnetic field
Carbohydrates are the main energy source. But lipids are used for storing energy so
living things are alive and they eat and breath air. like so humans, plants, animals.
non-living things are not alive so they dont eat or breath air. for example sunlight, rocks, water, air
Water molecules ,some ions ,non polar compounds and glucose can pass through a cell membrane
