A
Explanation:
it’s the one that makes the most sense !
Answer:
B
Explanation:
The Earth is tilted 23.5 degrees on its vertical axis. During the northern hemisphere's spring and summer, the northern hemisphere is tilted towards the Sun.
Because bacteria mutates that's why we have a new flu vaccine every year , because strains of DNA in the bacteria change all the time.
The _Embryo_ is the answer
Hope this helps
