What substance, if added to the mixture of salt and sand, could be separated from the mixture using a sieve?

What is the change in internal energy if 20 j of heat is released from a system and the system does 50 j of work on the surroundings? a. -70 j b. 30 j c. -30 j d. 70 j

Gproblem 1.3 find the power supply voltage vdd which results in a minimum clock period equals to 500ps. what is the maximum dynamic power dissipation for the inverter driving the load could given this new vdd and the sizes you found in problem 1.1

In the nineteenth century, gregor mendel first determined some basic rules of genetics that have been observed throughout all types of life. no observations have disproved these basic rules of genetics. charles darwin developed the idea of biological evolution around the same time, but he was unaware of mendel’s discoveries in genetics. over a century later, darwin’s idea of evolution was modified in order to incorporate mendel’s rules of genetics along with the other evidence that darwin had used.what is  most likely  the relationship between mendel’s rules of genetics and darwin’s idea of biological evolution? mendel’s genetics states laws that are now part of the theory of biological evolution.biological evolution states laws that are part of mendel’s theory of genetics.mendel’s genetics replaced darwin’s entire concept of biological evolution.biological evolution is a law that explains why all genetics exist