3. When you skateboard on a ramp,
A sliding friction occurs.
B static friction occurs.
C rolling friction occurs.
D fluid friction occurs.

In the sentence "a mining company will consider the distribution of coal when deciding how to mine the coal," what does the word distribution mean?

Read the article and use the information to answer the questions that follow discovering the structure of dna explain how the discoveries by rosalind franklin watson and crick build an accurate model of dna done

Plants need carbon dioxide from their environment to produce glucose during which stage of photosynthesis?