We need carrier proteins for steroid hormones because they help in the transportation from the cell they were released from to their target cell.
let me know if you have any further questions
:)
Answer:
A
its just the letter A......
The Ptolemaic model of the solar system was geocentric, meaning that it was the earth that was at the center of the universe — and everything revolved around it. The main difference between it and other models was that they were heliocentric, where it was the sun at the center of the solar system with the planets revolving around it.
Hope this helps!
