Answer:
The embryo develops the heart, nervous system and face.
Explanation:
The nervous system is one of the first things to develop, following is the heart and then their face. Physical traits which also develop are the arms, legs and sexual organs.
Answer:
B
Explanation:
U(uracil) pairs with A(adenine), G(guanine) pairs with C(cytosine)
There are multiple differences between RNA and DNA
1. DNA has two strands whereas RNA has one
2. DNA has deoxyribose sugar while RNA contains ribose sugar
3. DNA contains thymine instead of RNA's uracil
4. DNA cannot leave the nucleus and RNA can (mRNA)