Ap psych

many psychologists are skeptical of claims that chimpanzees can acquire language because the chimps have not shown the ability

a) use symbols meaningfully
b) acquire speech
c) acquire even a limited vocabulary
d) use syntax in communicating

How would you like us to answer that question?

The did multiple things that the economy

Some connecting rods have to lubricate the cylinder wall or piston pin. the answer is letter d. graphite coating can be a major  additive to many  coating  systems and things such as connecting rods.  it functions as a refractory, lubricant, thermal conductor, and electrical conductor for a machine or thing to enhance its work.