If you need to perform hand hygiene and do not have access to running water, using your personal anti-bacterial lotion is sufficient.

The body is protected against harmful flu viruses by

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

How do you think earths interior affects what is happening on the surface? 2. how do fossils support the continental drift hypothesis? 3. how does sea- floor spreading support the hypothesis of continental drift? 4.what do scientists observe when they studied the magnetic fields of rocks on the sides of mid-ocean ridges? 5. what is a tectonic plate ? 6. explain mantle convection 7.how can movements of the continents affect earths climate? 8. what occurs during drifting?