PLEASE HELP !! write down your observations of what the pieces of cabbage in the images look like

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion