Hey Im Chloe, Can You Help Me? Thank you! I Will give Brainlest! What is the mass of Na2CO3 required to make a
500 mL standard solution of 0.400 mol/L Na2CO3?
A). 212 g
B). 23.4 g
C). 25.8 g
D). 27.39

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?

1) describe the physical layout of the ocean floor ? 2) explain how the dumbo octopus swims differently than other octopus species and why this would be an advantage in the aphonic zone . 3) why are the types of organisms that live at each underwater hot vent so dramatically different ?