01:32:39
Which best describes eras and periods?
Eras have a smaller time span than periods.
Eras and periods are independent of each other.
Eras and periods both appear at the start of the Cambrian period.
Eras were more recently established on the time scale than periods.
Answers: 3
Health, 21.06.2019 16:40, quoia89
Abanana can be an excellent source of potassium in our diet. there is a naturally occurring, long-lived, radioactive isotope of potassium, 40-19k, which has a natural abundance of 0.0117% and a half-life 1.27 billion years. estimate the activity of a typical banana due to this potassium isotope assuming that most of the mass is in stable potassium.
Answers: 1
Health, 21.06.2019 17:30, ghkfkhgm859
What are phobias? and what are 5 common phobias that people have?
Answers: 2
Health, 22.06.2019 09:40, elitehairnerd1964
What causes fermentation a. antibodies b. antigens c. microorganisms d. antibiotics
Answers: 2
01:32:39
Which best describes eras and periods?
Eras have a smaller time span than peri...
Eras have a smaller time span than peri...
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