By 1999, after the clean water act had been passed in 1970 the percentage of us surface waters safe for fishing ans swimming increased from 36 percent to

The population of bacteria in a petri dish doubles every 40 seconds. the population of the bacteria is initially 400 organisms. what unit is most appropriate for the time at which the number of bacteria is 300? hour bacteria per hour second bacteria per second

Using meiosis, the sporophyte produces spores that are .

If an organ has six haploid chromosomes,how many chromosomes are present. 6 12