2 years ago

What are three anatomical features that birds share with their theropod ancestors

1 answer:

6 0

Three anatomical features that birds share with their theropod ancestors are:
1. they had light, hollow bones
2. they rearranged hip and leg muscles because this of improved bipedal movement
3. they had their flight oriented with the use of wings for balance

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a man is twice as old as his son.Five years ago the ratio of their ages was 9:4.Find the sum of their ages

elena-s [515]

Answer:

75years

Explanation:

Let the Father's age be represented by 2x

Let the Son's age be represented by x

Five years ago;

Man's age will be = 2x - 5

Son's age will be = x - 5

If the ratio of their ages five years ago was 9:4, then;

2x - 5/x-5 = 9/4

4(2x - 5) = 9(x - 5)

8x - 20 = 9x - 45

- Collect like terms

-20 + 45 = 9x - 8x

25 = x

Hence, the son's age = 25 years

If x = 25, the father's age (2x) will be 2 × 25 = 50years

The sum of their ages will be = 25years + 50years = 75years

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hram777 [196]

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Explanation:

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