Elle placed a bucket under a leaky roof. the bucket was 2/5 full after one-half hour. what is the rate in buckets per hour

Generally speaking, a rate is a ratio of an amount with respect to time. In this case, it is the ratio of buckets to time in hours. Assuming the rate is constant, then the solution for this problem is as follows:

Rate = 2/5 bucket ÷ 1/2 hour
Rate = 0.8 bucket/hour

DNA technology in agriculture has been used to create Genetically Modified Organism. The plants can be modified to be resistant to drought and diseases/pests and have increased yield

DNA technology mainly involves the manipulation of the genome of an organism. Usually a foreign DNA is inserted in the genome of another organism to impart it with desired characteristics or remove undesired ones.