Biology, 26.02.2020 07:48 zeinabelsiblini
Which of the following may not have been possible without the presence of ozone in the atmosphere?
A) Oxygen may not have been able to accumulate in the atmosphere
B) Photosynthesis may never have developed.
C) Respiration may never have developed.
D) Life may not have been able to move onto Earth’s land surfaces
Answers: 1
Biology, 22.06.2019 04:10, zairaefh3200
Select the correct answer. tay-sachs disease is caused by a mutation in the hexa gene located on chromosome 15. tay-sachs follows an autosomal recessive pattern of inheritance. with the of the diagram, identify which of the offspring will be an unaffected carrier. a diagram showing the genes of parents who are carriers of tay-sachs disease a. a, b, and c b. b and c c. a and d d. a e. d
Answers: 3
Biology, 22.06.2019 13:10, hcoulter15
Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.
Answers: 2
Which of the following may not have been possible without the presence of ozone in the atmosphere?
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