Answer:
A. Casts
Explanation:
A mold fossil forms when the remains of an organism leave a mark in sediment that hardens before the organism rots or is washed away. Sediment can then fill in that mold, forming what looks like a sand or clay version of the organism; this is called a cast fossil.
1: Less Homes For Polar Bears
2: The movement of the waters would be fast and not steady
3: The Climate would change.
When sound waves hit a solid surface they either reflect, refract, or absorb.
Echo's are caused by the reflection of sound waves.
You never can know the exact value of a physical or chemical dimension because several reasons: all the instruments have a certain sensibility (sensibility is the smallest variation of the dimension that the instrument can measure) that cannot be overcame.
Answer: mitochondria functioning as the main organelle where the rest of the process continues and finishes.
Explanation:
