Fossils of the Dorudon, an aquatic mammal that lived over 40 million years ago, show a whale-like animal that had small, underde
veloped hind limbs
Which best explains how fossils like the Dorudon support the theory that plant and animal life has evolved over time? (SC.7.L.15.2)
They confirm that many animals have not evolved
They confirm that many animals have not evolved
They prove that all animals evolved from a single ancestor
They demonstrate that animals that dont evolve will die out
Plzzzzz fastt
Which best explains how fossils like the Dorudon support the theory that plant and animal life has evolved over time? (SC.7.L.15.2)
They confirm that many animals have not evolved
They confirm that many animals have not evolved
They prove that all animals evolved from a single ancestor
They demonstrate that animals that dont evolve will die out
Plzzzzz fastt
1 answer:
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Ionic compounds are formed between oppositely charged ions.
A binary ionic compound is composed of ions of two different elements - one of which is a positive ion(metal), and the other is negative ion (nonmetal).
To write the empirical formula of binary ionic compound we must remember that one ion should be positive and other ion should be negative, then only the correct formula should be written. To write the empirical formula the charges of opposite ions should be criss-crossed.
First empirical formula of binary ionic compound is written between
First Formula would be
Second empirical formula is between
Second Formula would be
Note : When the subscript are same they get cancel out, so would be written as
Third empirical formula is between
Third Formula would be :
Forth empirical formula is between
Forth Formula would be : or
Note- The subscript will be simplified and the formula will be written as .
The empirical formula of four binary ionic compounds are :
