Answer:
Elements cannot be broken down into a simpler substance. Likewise, one element cannot be chemically converted into a different element. Chemical elements are the simplest of substances.
Explanation:
i just said this in the comments
The correct answer is d: cDNA.
<span>cDNA or complementary DNA is DNA synthesized usually from messenger RNA (mRNA) by the enzyme reverse transcriptase. Because this molecule is from mRNA it contains only exons. cDNA is also produced naturally by retroviruses, for example, HIV virus.</span>
Answer: It is, (False, it should read, “Learned behavior is not inherited. It is developed through observation and experience and allows animals to adapt to changes in the environment.”)
Explanation:
When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. Solid water, or ice, is less dense than liquid water. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density.
I think that it is true but not 100% sure