It is D & E. Uranus is Helium & Hydrogen, And it has dark rings
The endocrine system is made of glands that secrete hormones. These hormones help regulate the organs and cells activity. The hormones among other things control your metabolism.
C lol trying to get points
1) all of the above
2) rocketry
3) 1
4) not sure about this one because magnitude of one was the brightest then 2, then 3. 6 was the least brightest and 6+ or -1 or 0 or you could say, below 1 did not exist at that time..
Aquatic ecosystems can be classified as freshwater and marine ecosystems.
