#1. Another name for unicellular organisms that dominated Earth up to the Precambrian time is A. eukaryotes. B. cyanobacteria. C. stromatolites. D. prokaryotes. #2. The greenhouse effect is related to the phenomenon of an increase in average surface temperature known as A. air pollution. B. agricultural improvement. C. global warming. D. conservation. #3. Which colorless and odorless gas, produced by radioactive decay of Uranium-238, is considered to be a cancer-causing agent? A. Oxygen B. Hydrogen C. Boron D. Radon.#4. Scientists can determine if oxygen existed in Earth's Archean atmosphere by A. determining how many people survived. B. looking for oxidized iron in rocks. C. looking at the amount of salt content in rocks. D. determining the lack of oxidation that occurred.

Question

jasObogaera jasObogaera

11-06-2016
Biology

contestada

#1. Another name for unicellular organisms that dominated Earth up to the Precambrian time is A. eukaryotes. B. cyanobacteria. C. stromatolites. D. prokaryotes. #2. The greenhouse effect is related to the phenomenon of an increase in average surface temperature known as A. air pollution. B. agricultural improvement. C. global warming. D. conservation. #3. Which colorless and odorless gas, produced by radioactive decay of Uranium-238, is considered to be a cancer-causing agent? A. Oxygen B. Hydrogen C. Boron D. Radon.#4. Scientists can determine if oxygen existed in Earth's Archean atmosphere by A. determining how many people survived. B. looking for oxidized iron in rocks. C. looking at the amount of salt content in rocks. D. determining the lack of oxidation that occurred.

Respuesta :

Otras preguntas

When do you use a solid line for graphing a linear inequality?

how did oliver cromwell affect society today?

How have some rainforest plants adapted to receive enough sunlight? O by growing poisonous flowers O by growing giant, slippery leaves O by growing giant, brigh

You are cutting a rectangular piece of fabric in half along a diagonal. The fabric measures 28 inches wide and 1 1/4 yards long. What is the length (in inches)

Which of the following images illustrates safe driving?

factor fully if possible 4^2 + 12 + 9^2 − 25^2

48:21 Principle types of crime in the United States include a. violent crimes. c. white collar crime. b. crimes against property. d. all of the above Please sel

The right triangle on the right is a scaled copy of the right triangle on the left. Identify the scale factor. Express your answer in simplest form

89, 93, 72, 80 The minimum grade he must get on the test in order to have an average of 85 is?

Which of these is NOT one of the nine countries that will make up half of the world's growth rate?

Kalahira Kalahira · Answer 1 · 2017-08-11T04:48:11+02:00

The correct answer for question number 1 is A - eukaryotes are the name for unicellular organisms that dominated earth up to the Precambrian times.

The correct answer for question number 2 is C - the greenhouse effect is related to the phenomenon of an increase in average surface temperature known as global warming.

The correct answer for question number 3 is D - the colourless and odourless gas that is produced by the radioactive decay of Uranium-238 and is considered to be a cancer-causing agent is Radon.

The correct answer for question number 4 is B - Scientists can determine if oxygen existed in Earth's Archean atmosphere by looking for oxidized iron in rocks.