Mathematics, 25.05.2021 21:10 makaylaf9479
Question of 19
Land plants evolved long before any animals appeared on Earth. When they came onto land, they needed ways to keep from losing water, to reach the sun, and to produce oxygen. They started to convert the atmosphere from carbon
dioxide to oxygen. Which of these is believed to be the common ancestor of land plants?
O A. oak trees, because they are the dominant species in many areas
OB rose bushes, because they produce a sweet smelling aroma
OC grass, because there is so much of it found on the land
OD. green algae, because they use the same photosynthetic pigments as land plants
Answers: 1
Mathematics, 21.06.2019 17:50
On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.
Answers: 2
Mathematics, 22.06.2019 03:00
M∠abc=138° and m∠def=31° . which statement is true about ∠abc and ∠def ? a: the angles are neither complementary nor supplementary. b: the angles are complementary. c: the angles are supplementary.
Answers: 1
Question of 19
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