Which event provides evidence that matter can bend light waves?
A. Light waves travel at a sp...
Biology, 27.02.2020 19:25, jennifer2129
Which event provides evidence that matter can bend light waves?
A. Light waves travel at a speed of about 300,000,000 m/s in empty space.
B. Green plant leaves absorb the red light waves found in sunlight.
C. A clear glass window allows people to see what is happening on the other side.
D. A rainbow results when visible light waves pass through water droplets in the air.
Answers: 1
Biology, 22.06.2019 00:10, bobtothemaxthe1st
Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.
Answers: 1
Biology, 22.06.2019 13:00, mimivenga
Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?
Answers: 1
Biology, 22.06.2019 15:30, goodluck99
Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food
Answers: 1
Mathematics, 15.01.2020 12:31
Biology, 15.01.2020 12:31