Biology, 03.12.2020 09:00 1963038660
In 1939, the use of DDT (a powerful synthetic chemical) as an insecticide was discovered. The United States adopted its widespread use, producing up to 100 million kilograms per year (200 million pounds per year). Twenty years later, severe side effects started to be reported as a result of DDT use. Which was an advantage of using DDT? insect and pest populations decreased birth defect rates increased cancer rates increased fertility rates decreased
Answers: 2
Biology, 22.06.2019 05:30
Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !
Answers: 1
Biology, 22.06.2019 16:30
Brepresent the dominant allele for brown fur, and b represents the allele for white fur. if two rabbits with the genotype bb reproduce, what are the possible phenotypes for their offspring
Answers: 1
Biology, 23.06.2019 00:20
When can exponential growth happen? a: when there are limited resources b: when carrying capacity is reachedc: when there is no competition d: when the death rate is high
Answers: 2
In 1939, the use of DDT (a powerful synthetic chemical) as an insecticide was discovered. The United...
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