The endothermic process is any process which requires or absorbs energy from its surroundings, usually in the form of heat. It may be a chemical process, such as dissolving ammonium nitrate in water, or simply the melting of ice cubes.
Gastric juice would digest the stomach lining, resulting in ulcers.
Binary Fission is the process by which bacteria reproduce, also known as asexual reproduction. I hope this helps. If not, comment below and I will do my best to get back to you ASAP, and don't be afraid to go to your teacher for help; it will be much easier on you to have someone explain it to you physically. :)
