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Ainat [17]
3 years ago
11

What evidence would support Maria's claim that the fossilized remains are that of a bird, class Aves, instead of a turtle, class

Reptilia? A) the eggs B) a backbone C) a keeled sternum D) warm-bloodedness
Chemistry
2 answers:
lora16 [44]3 years ago
6 0

Your answer would be C.

Ulleksa [173]3 years ago
3 0

Answer:

The correct answer is option c, that is, keeled sternum.

Explanation:

In the given question, there is a need to access the skeleton or the fossilized remains of the species. The turtles possess bony, tough shells that safeguard their body. It exhibits a domed top (carapace) and a flat layer underneath the belly (plastron). The backbones of the turtles are amalgamated with the bones in their shells.  

While, the birds exhibit a lightweight skeleton, which is formed majorly of thin and hollow bones. If the skeleton possesses a breastbone, or the keeled sternum, then what they have found is most probably the nest of the bird.  

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What is the pH of a solution of 0.800 M KH2PO4, potassium dihydrogen phosphate?
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KH₂PO₄ hydrolyzes as;
H₂PO₄⁻ + H₂O ↔ H₃PO₄ + OH⁻
Let x amount of H₂PO₄⁻ has reacted with water then,
Kb₁ = [H₃PO₄][OH⁻] / [H₂PO₄⁻]
[H₂PO₄⁻] = 0.8-x M
Kb₁ = x² / (0.8 - x)
Given Ka₁ = 7.5 x 10⁻³
so Kb₁ = 1 x 10⁻¹⁴ / (7.5 x 10⁻³) = 1.33 x 10⁻¹²
From this information:
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x = [OH⁻] = 1.03 x 10⁻⁶ M
pOH = - log (1.03 x 10⁻⁶) = 5.99
pH = 14 - pOH = 14 - 5.99 = 8.01 



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