Why is the date for the origin of multicellularity so difficult to determine a

Why is the date for the origin of multicellularity so

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20. Why is the date for the origin of multicellularity so difficult to determine? a.There is very little fossil evidence of the earliest multicellular organisms. b.The fossil layers that contain the first multicellular organisms do not contain uranium and so can’t be accurately dated. c.The first multicellular organisms evolved on land. d.There are no sedimentary rocks from the period of time that includes the origin of multicellular organisms. 21. Which of the following organisms would be a good model for studying the origin of multicellularity? (select the two best answers) 22. Which of the following is a major advantage of multicellular organisms? Match the type of rock listed on the left with its description on the right. 23. Sedimentary B 24. Igneous D 25. Metamorphic C 26. I find a rock that can be radioactively dated. Newly formed rock of the same type and size has 48ug of a radioactive element, but the older rock only has 3ug of the same element. If the half-life of this element is 15 million years, how old is the older rock? a.3 million years old b.15 million years old c.48 million years old d.60 million years old e.100 million years old 27. Select the list of groups below that places them according to their order, with the most ancient origin first and the most recent origin last.
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