Eutrophication is often the result of

a. increases in animal populations
b. lack of oxygen in the water
c. fertilizer runoff entering aquatic ecosystems
d. a decrease in phytoplankton populations

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

Across of blue x blue (both heterozygous) would result in