The mass-abundance of the nine most abundant elements in the Earth's crust is approximately: oxygen 46%, silicon 28%, aluminum 8.3%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium 2.0%, and titanium 0.61%. Other elements occur at less than 0.15%
I believe the answer is C. I may be wrong tho.
I thought I already answered this but anyways, the answer is A. Zebras will live and graze in herds. When a predator spooks the herd the zebras run as one. That ways it confuses let's say the lion because they see in black and white. To them they see racing stripes so it's hard for them to decide which zebra to take down. If running together backfires, the zebras will stand their ground and protect the weaker and younger zebras by kicking and biting the lions. Hope this helps!
