1. how did astronomers confirm the existence of dark energy?
a. by calculating it using keple...
1. how did astronomers confirm the existence of dark energy?
a. by calculating it using kepler’s third law
b. by measuring the mass of galaxies
c. by detecting it with telescopes
d. by the ages of globular clusters
2. how did astronomers confirm the existence of dark matter?
a. by measuring how fast the universe is expanding
b. by detecting very hot gas in galaxy clusters that emits x-rays
c. by measuring the amount of compressed gas in the universe
d. by detecting electromagnetic radiation reflecting from the dark matter
Answers: 1
Biology, 22.06.2019 07:00
Environmental science are unconsidered with methods to preserve natural resourcesa.trueb.false
Answers: 1
Biology, 22.06.2019 08:30
Which best describes a benefit of using dna technology in medicine? a) medicine can be produced in mass quantities. b) medicine can be distributed at a reduced cost. c) medicines have fewer side effects. d) medicines are resistant to antibiotics.
Answers: 3
Biology, 22.06.2019 13:10
Which of the following is not a benefit of genetically modified foods? a.pest-resistant crops b.herbicide-resistant crops c.plants that do not require water?
Answers: 2
Biology, 22.06.2019 13:30
Color blindedness is a sex-linked trait. if we could see the pedigree chart for several more generations of the family illustrated here, we would expect a) more males to be color blind. eliminate b) more females to be color blind. c) no females to ever be color blind. d) an equal number of males and females that are color blind.
Answers: 2
Mathematics, 04.12.2020 20:50
Mathematics, 04.12.2020 20:50
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Mathematics, 04.12.2020 20:50
Mathematics, 04.12.2020 20:50
Mathematics, 04.12.2020 20:50
Mathematics, 04.12.2020 20:50
Mathematics, 04.12.2020 20:50