Explanation:
If water did not expand when freezing, then it would be denser than liquid water when it froze; therefore it would sink and fill lakes or the ocean from bottom to top. Once the oceans filled with ice, life there would not be possible.
The miThe migration of birds.
C) Crops may cause an increase of allergic reactions in humans.
Answer:
All animals went through 23 Carnegie stages
All the animals are vertebrates
Explanation:
The lines of all reached the end of 23.
Carnegie stages are used only for vertebrate embryos,
Answer: double helix
Explanation: The double helix of DNA is, like its name implies, in the shape of a helix which is essentially a three dimensional spiral. The double comes from the fact that the helix is made of two long strands of DNA that are intertwined—sort of like a twisted ladder.
