1. A
2. B
3. A
4. A
5. A
6. C
7. A
8. A
9. ?
10. A
The Cambrian period, part of the Paleozoic era, produced the most intense burst of evolution ever known. The Cambrian Explosion saw an incredible diversity of life emerge, including many major animal groups alive today. Among them were the chordates, to which vertebrates (animals with backbones) such as humans belong. These included brachiopods, which lived in shells resembling those of clams or cockles, and animals with jointed, external skeletons known as arthropods—the ancestors of insects, spiders, and crustaceans. These toughened-up creatures represented a crucial innovation: hard bodies offering animals both a defense against enemies and a framework for supporting bigger body sizes.
Answer:
<h3>A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic. Each prefix has a unique symbol that is prepended to any unit symbol.</h3>
Answer:
12 Oxygen Atoms
Explanation:
We need to figure out how many atoms of Al, S and O are represented by the these two similar formulas:
Al2(SO4)3:
Al2 means 2 aluminums, (SO4)3 means 3 (SO4)s. The grand tally: 2 aluminum atoms + 3 sulfur atoms + 12 oxygen atoms = 17 atoms total in each molecule.
Hope this helps!
U gotta know the atom numbers of each all 161/100=m/…. Well we have to know the capacity of CCl4 to do this question how many moles do we have ? Let’s say 1 okay then m will be 1.61 After finding it we are gonna add 79.35g
79.35+1.61=80.96 hope that it helped ;)
