Answer:
Around 4.1 billion years ago, the first single celled life form appeared on Earth
Provides protection and support
Resting potential is when the outside is more positive, while the inside of the membrane is approximately -70mv
Answer:
antero-posterior
Explanation:
the axis that determines the body pattern from the nose to the tip of the tail
B) 70 million years
Because it is a little below 60 million years meaning it is a little older than 60 million years
