The answer to your question is A.
Answer:
A. Organ.
Explanation:
Cells make up
tissues, tissues make up an organ. Organs make organ system
Answer: The nodes of Ranvier
Explanation: The speed of impulse conduction along an axon are increased by this.
A hypothesis is classified as an ¨If, Then¨ statement. Example: If I punch a brick, then it will hurt.
Answer:
C & D
Explanation:
C - The Sun has an 11 year solar cycle. When the solar cycle is at a <em>minimum</em>, active regions of the sun are rare and not many solar flares are detected. They dramatically increase as the Sun approaches the <em>maximum</em> part of its cycle.
D - It's the Sun. It's moody. Solar flares are pretty sporadic, they're sudden and often unpredictable.