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Why were grandfather clauses able to exclude African Americans from voting while protecting the voting rights of poor whites?

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天然痘に関するいくつかの重要な事実が述べられています。- 天然痘の突然変異率は遅いです。- 天然痘は人間だけに感染します。- 症状が現れる前の感染力は最小限です。さらに、天然痘が他の病原体からいつ生じたかを特定するのは一般的な病原体よりも難しいと述べられています。これは、最近の気付きに基づいています。西アフリカと南アメリカのバージョンがお互いに最も類似していることが明らかになったためです。これらのバージョンがおそらく大西洋奴隷貿易の初期にお互いから分岐したと考えられています。このことから、天然痘がらくだ痘またはタテラポックスから生じたとされるのは約3000〜4000年前であることがわかります。

Eric Clapton, founder of the psychedelic blues group, cream, was the original guitar player with which other British group

Antibiotics can be used to kill the specific pathogenic bacterium, Mycobacterium tuberculosis, that causes tuberculosis. The appearance of antibiotic-resistant strains has made it more difficult to cure M. tuberculosis infections. These antibiotic-resistant bacteria survive and pass on the genes to their offspring, making the resistant phenotype more common in the population.DNA analysis indicates that the genes for antibiotic resistance are not normally present in bacterial chromosomal DNA.Which of the following statements best explains how the genes for antibiotic resistance can be transmitted between bacteria without the exchange of bacterial chromosomal DNA?(A)The antibiotic-resistant bacteria release a hormone that signals neighboring bacteria to become resistant.(B)The genes for antibiotic resistance are located on a plasmid that can be passed to neighboring bacteria.(C)The antibiotic-resistant bacteria are the result of bacteria that specifically modify their own chromosomal DNADNA to neutralize the antibiotics.(D)The antibiotic alters the bacterial genome of each bacterium, which results in an antibiotic-resistant population.

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