1. RNA has ribose sugar instead of deoxyribose
2. RNA is generally single-stranded instead of double-stranded
3. RNA contains uracil in place of thymine
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:
Involuntary muscles is the answer so b
Answer:
These spheres are closely connected. For example, many birds (biosphere) fly through the air (atmosphere), while water (hydrosphere) often flows through the soil (lithosphere). In fact, the spheres are so closely connected that a change in one sphere often results in a change in one or more of the other spheres.
Explanation:
Change the wording other wise hoping this helps
