Answer:
the amount of calcium is variable.
Explanation:
osteoporosis is an illness that is caused by lack of calcium in a person's body.
Answer:
A=4
B=1
C=3
D=2
Explanation:
hope this helps you to understand now :)
Second one: Water expands when it freezes
The answer is; SET B
Polar molecules interact well with water because there are charged. Water molecules are partially charged (the oxygen end is partially negative while the hydrogen end is partially positive). Therefore polar molecules can interact stably with charged molecules. The hydrophobic end is non-polar and is ‘water-hating’. When mixed with water, the non-polar region clumps up into globules so they don’t interact with water.
Answer:
D. They increase soil nutrient levels
