Diamond is a non-metal that is a good insulator due to its strong covalent bonds.

Nitrogen is a key component of DNA, forming part of the nucleotides that make up the genetic code.

Nitrogen is a key component in fertilizers, promoting plant growth.

25.00 has 4 significant figures due to the trailing zeros after the decimal.

The number 100 has only 1 significant figure unless specified otherwise.

0.00560 has 3 significant figures, 0.0560 has 3 significant figures, 0.560 has 3 significant figures, and 5.60 has 3 significant figures. However, 0.00560 is the smallest number, but all have the same count of significant figures.

7.890 x 10^3 has 4 significant figures, while the others have 3, 3, and 4 respectively, but the leading zeros in the first and last options do not count.

0.0300 has three significant figures (the zeros after the 3 are significant because they come after a decimal point).

15 is the smallest common multiple of 3 and 5, and 30 is also a common multiple. However, 15 is the first one listed.

12 is the smallest common multiple of 4 and 6, and 24 is also a common multiple, but 12 is the smallest.

12 is a factor of 144 because 144 ÷ 12 = 12, which is an integer.

12 is a factor of 48, as 48 divided by 12 equals 4, which is an integer.

12 is a factor of 60 as 60 divided by 12 equals 5 with no remainder.

12 is the smallest number that is a multiple of both 4 and 6.

The LCM of 8 and 12 is 24, which is a multiple of both.

25 is a perfect square (5^2).

121 is divisible by 11, as 121 = 11 x 11.

A number is divisible by 15 if it is divisible by both 3 and 5. 30 meets both criteria.

28 is divisible by 7 (28 ÷ 7 = 4). The other numbers are not.

A number is divisible by 8 if the last three digits form a number that is divisible by 8. 64 is divisible by 8.

A number is divisible by both 2 and 5 if it ends in 0. 20 ends in 0, thus it is divisible by both.

7 is not a factor of 60, as 60 cannot be divided evenly by 7.

50 is not a multiple of 11, while the others are.

35 is not a multiple of 6, while 18, 24, and 30 are all multiples of 6.

To check divisibility by 11, subtract the last digit from the rest of the number. For 154, 15 - 4 = 11, which is divisible by 11. The others are divisible.

55 is not divisible by 12, as it does not meet the criteria of being divisible by both 3 and 4.

A number is divisible by 3 if the sum of its digits is divisible by 3. The sum of the digits of 22 (2 + 2 = 4) is not divisible by 3.

40 is not divisible by 7, while 21, 28, and 35 are all multiples of 7.

A number is divisible by 8 if the number formed by its last three digits is divisible by 8. 90 is not divisible by 8.

A number is divisible by 9 if the sum of its digits is divisible by 9. The sum of the digits of 50 (5 + 0 = 5) is not divisible by 9.