What was leonardo da vinci's most important contribution to western art?
a. he inaugurated the focus on human bodies in painting.
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b. he established geometric principles of perspective,
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c. he invented an oil paint that allowed more realistic depiction.
d. he introduced the idea of scientific observation.

Iwill be giving 15 points to whoever answers the concept of checks and balances means that each branch of governmenta. has its own powers and responsibilitiesb. is clearly described in articles of the constitutionc. has the ability to correct the other branches in case of an errord. is set up so that in case of constitutional crisis, the governement will continue to operate

Why did einstein write a letter to president roosevelt

How does that author support the idea that kahlo behaved differently than other women during her time?