If ‘8’ Drosophila in a laboratory population of ‘80’ died during a week, the death rate in the population is ___________ individuals per Drosophila per week.

Yesterday 700 flies were eaten by frogs in the park. Today the number of flies decreased to 560 flies. By what percentage has the number of flies eaten decreased?

A population of snakes has 900 individuals. They have a death rate of 30 per year and a birth rate of 20 per year. Assuming 6 snakes migrate into the population and 3 migrate out of the population per year, how many individuals would there be after the first year? (To answer, write numerals in the box below.) Fill in the blank

In most parts of the world, the number of people 60 years or older is ____________, while proportionately the number of people in the younger generation that will help care for the aging generation is ______________.Group of answer choicesdecreasing; increasingdecreasing; staying the samestaying the same; decreasingincreasing; decreasing

A population of lizards has 1,000 individuals. They have a death rate of 22 per year and a birth rate of 30 per year. Assuming 5 lizards migrate into the population and 2 migrate out of the population per year, how many individuals would there be after the first year? (To answer, write numerals in the box below.) Fill in the blank

For the world as a whole, the growth rate is simply ______.Multiple choice question.the difference between births and deaths per 1,000 populationthe number of children who survive to adulthoodthe difference between immigrants and emigrants per 1,000 populationthe number of live births in a given period of time