Biology, 18.03.2021 01:10 Fintastichumanoid
Iridium is an element that is rare on Earth but commonly found in meteorites. A scientist believes that the first organic molecules may have come to Earth on meteorites 3.6 billion years ago. Which of these would be an appropriate null hypothesis to test related to whether meteorites hit the Earth 3.6 billion years ago?
If sediment layers that are 3.6 billion years old are tested, they will contain relatively high iridium levels, because that is when many meteorites crashed into the Earth.
A
There is no difference in iridium levels in sediments that were deposited on Earth 3.6 billion years old, compared to recent sediments.
B
If a sediment layer that is 3.6 billion years old is tested, it will contain organic material.
C
If recently fallen meteorites and meteoroids collected in space are tested, they will not contain organic molecules.
Answers: 2
Biology, 21.06.2019 23:30
Tara sees a commercial for a brand of pills that promise to boost energy and people perform better in work and school. as people in the commercial talk about how much better they feel when taking the pill, tara notices a message on the bottom of the screen that reads, "this pill is not approved by doctors and has not been tested in controlled experiments." what is the best conclusion that tara should make about the commercial? it is making scientific claims based on subjective observations. it is making scientific claims based on opinions instead of pseudoscientific facts. it is making pseudoscientific claims based on objective observations. it is making pseudoscientific claims based on opinions instead of scientific facts.
Answers: 1
Biology, 22.06.2019 10:20
Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false
Answers: 2
Biology, 22.06.2019 12:30
This is collection of data made by comparing objects in standard units. in science, the units are metric.
Answers: 3
Biology, 22.06.2019 12:30
Wich of the following are manual restraint techniques for dogs
Answers: 2
Iridium is an element that is rare on Earth but commonly found in meteorites. A scientist believes t...
Mathematics, 02.03.2021 20:30
Computers and Technology, 02.03.2021 20:30
Mathematics, 02.03.2021 20:30
Mathematics, 02.03.2021 20:30
History, 02.03.2021 20:30
Mathematics, 02.03.2021 20:30
Mathematics, 02.03.2021 20:30
Mathematics, 02.03.2021 20:30
Mathematics, 02.03.2021 20:30
Mathematics, 02.03.2021 20:30
Health, 02.03.2021 20:30
Biology, 02.03.2021 20:30
Mathematics, 02.03.2021 20:30