40 points
which organisms turn nitrogen gas into forms that plants can use
a) bacteria
b) fungi
c) algae
d) animals

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur

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?