The most cost effective method to test the compressive strength of hardened concrete is _______.

All concrete must be ________________ .

If the concentration of sodium ions in the fluid surrounding cells decreases and the concentration of other solutes remains constant,

The Incas absorbed the religions of conquered people, and added the royal cult of the sun to daily life and worship.

The Portuguese were driven to expand primarily by the pull of opportunities abroad.

Sugar was native to the Americas.

There is no evidence of significant contact between he Aztecs and Incas.

Indian fabrics came to dominate Eurasian markets because of technological innovations that made them both more available and more desirable.

The presence of cholesterol in the plasma membranes of some animals 

What is the significance of selective permeability to biological membranes? (1.5 point)