The plasma membrane of a human cell:

prevents outside substances from entering

prevents materials from exiting the cell

acts as a selective gatekeeper

provides rigidity

What is the Truman Doctrine? the Soviet Union policy to contain and challenge capitalism the U. S. policy to contain and challenge communism the Soviet policy to spread communism the U. S. policy to spread totalitarianism

Which statement best describes solon's reforms?

What month and year was martin luther king jr day first observed as a holiday?

Why did president kennedy get involved in Vietnam war

How have political parties changed the electoral college?

What compromises were made relating to slavery in the 1800s? What were their effects?

How did the iranian hostage crisis affect american opinion apex?

How was Stalin able to rise to power?

Explain four principles on which the Constitution is founded. How does the Constitution incorporate these principles into a plan for government?

Why did states with smaller populations object to the legislature proposed in the Virginia plan?