Answer:
Nitrogen
Explanation:
The air in the atmosphere is made out of 78% Nitrogen, 21% oxygen, and 1% other gases.
Answer:
The chemical defenses. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils. Pathogenic (disease-causing) microorganisms must make it past this first line of defence. If this defence is broken, the second line of defence within your body is activated.
Explanation:
Ralph and Harry would probably be as similar as twins that are raised together or even more similar than twins that are raised together.
Research has found out that, identical twins become more alike as they grow older, unlike fraternal twins who do not become more alike as they grow up.