Active transport requires the use of energy to move particles across a cell membrane, and Passive transport does not use any energy to move particles across the cell membrane. Hope this helped!
-TTL
Answer:
In uranium-lead dating, for instance, the radioactive decay of uranium into lead proceeds at a reliable rate. Based on the very old zircon rock from Australia we know that the Earth is at least 4.374 billion years old.
And that's how after rounding we know that earth is 4.5 years old.
Answer:
Changing with the climate
Fish make calcium carbonate by combining calcium from seawater with carbonate ions generated from CO2 in their bodies. If the amount of atmospheric CO2 goes up as expected leading to a CO2 increase in the oceans the fish may produce more carbonate ions and thus more calcium carbonate.
Explanation: