rc t rebos might chose building blocks have formed in space building blocks for
ID: 121400 • Letter: R
Question
rc t rebos might chose building blocks have formed in space building blocks for life came to Earth on a meteorite, under what con- 7 If the our answers to questions 18 and 19 on the table below and on your knowledge of biology. Radioactive Isotope Hal-Life Parent isotope of half-lives Number Daughter isotope 100,000 g 50,000 g 25,000 g 12,500 g 6.250 g 3,125 g 0 g 50,000 g 75,000 g 87,500 g 93,750 9 96,875 g 18 How many half-lives have passed when there is three times more daughter isotope than parent isotope? 19 How many grams of the parent isotope are left in the sample after three hal 20 Justify the argument that today's organisms would not exist if mass extinc- 21 Propose a hypothesis for the appearance of all animal phyla on Earth lives? tion had not occurred. within a relatively short period during late Precambrian time and the early Cambrian Period. 22 Some forms of air pollution reduce the thickness of Earth's ozone layer. How might this change affect modern life?Explanation / Answer
18.As 2 half lives are there in 25,000 parent and 75000 daughter element so the answer would be 2.
19.At 3 half life ,12500 parent element present so overall answer would be 0,125.
20,
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.