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Which of the following is an example of microevolution? A caterpillar changes form into a butterfly. A population of birds slowly changes feather color from red to blue. A dinosaur species evolves over time into a bird species. A black cat has kittens with white spots.

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Which of the following is an example of microevolution? A caterpillar changes form into a butterfly. A population of birds slowly changes feather color from red to blue. A dinosaur species evolves over time into a bird species. A black cat has kittens with white spots.

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Which organism lived on Earth during the Precambrian time? A. fern B. dinosaur C. cyanobacteria D. octopus

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The answer is the last one

let’s recall the rules for significant figures. 

for multiplication and division, you round to the least significant figures.

for addition and subtraction, you round to the least places after the decimal. 

1. 123 x 89= 10947, multiplication- since you have to round to the least sig figs, which is 2, the answer rounds to 11000

2. 8.85 + 1.11= 9.96, addition- since you have round to the least places after the decimal, which is 2, the answer rounds to 9.96

3. 15.2 / 30.3= 0.50165017, division- round to 3 sig figs, 0.502

8 –  2.55= 5.45, subtraction, least places after the decimal, which is none because of the whole number 8. the answer is 5. 

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