How do air masses affect the formation of tornadoes?
A. Tornadoes can form when two air masses move into each other.
B. Tornadoes can form when one air mass reverses direction.
C. Tornadoes can form when two air masses pass one another.
D. Tornadoes can form when one air mass moves in a circular direction.
Answers: 3
Biology, 22.06.2019 13:00
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 20:50
The genetic code is essentially the same for all organisms. based on this information, one can logically assume which of the following statements to be correct? a. dna was the first genetic material. b. the same codons in different organisms translate into the different amino acids. c. different organisms have different numbers of different types of amino acids. d. a gene from an organism can theoretically be expressed by any other organism. e. all organisms have experienced convergent evolution.
Answers: 3
Biology, 23.06.2019 00:00
The footprint of a dinosaur and the burrow of an ancient shrimp are examples of which kind of fossils a.body b.amber c.trace d.index
Answers: 3
How do air masses affect the formation of tornadoes?
A. Tornadoes can form when two air masses move...
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