<h2>
Answer:</h2>
ESCs are derived from the inner cell mass of an embryo, called blastocyst
Answer:
A. Layers that cut across the most other features are youngest.
Explanation:
Using the principles of cross-cutting relationships, you can determine the relative age of rocks found in the ground. The idea behind it is that the geologic feature which cuts another is the younger of the two features, and it had been around for 400 years. It's not very precise but it is good for determining relative age.
Because astrologers don't use tools , don't observe the planet.
Oxygen and carbon dioxide move across a cell membrane due to diffusion. Diffusion is a passive process as it requires no energy to move particles down the concentration gradient.