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3 years ago

Vertebrates developed about 550 million years ago. the oldest vertebrate fossils are those of _____ with no jaws.

Biology

2 answers:

Mekhanik [1.2K]3 years ago

7 0

oldest vertabrate fossils were fish with no jaws

jarptica [38.1K]3 years ago

3 0

Vertebrates developed about 550 million years ago. The oldest vertebrate fossils are those of FISH with no jaws. These e<span>arly jawless fish did not have paired fins and their bodies were covered with heavy, bony scaled, but their skeletons were made of cartilage. For the next 50 million years, they were the only vertebrates.</span>

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3 years ago

1.solve for p

Mnenie [13.5K]

<h3>1. <u>Answer;</u></h3>

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<h3>2. <u>Answers</u>;</h3>

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To solve for b when the value of a = 3

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we substitute 3 with a in the equation

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<h3>3. <u>Answer;</u></h3>

<em>r =d/t</em>

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To solve for r

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In order to get r, we divide both sides by t

<em>d/t = rt/t</em>

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<em>Width = 30 units</em>

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Thus;<em> Perimeter = 90 , length=15 </em>

<em> 90 = 2 (W + 15)</em>

<em>Dividing both sides by 2,</em>

<em>45 = w + 15 </em>

<em>Subtracting from both sides;</em>

<em>W = 45 -15 </em>

<em>W = 30 </em>

Therefore,<em><u> the width of the rectangle is 30 units</u></em>

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