The average speed of a greyhound dog increases gradually in succeeding generations after only the fastest of a brood are allowed to interbreed. what is this variation an example of?

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

Some mining processes involve removal of large areas of earths surface in the mined region this practice causes severe environmental damage by allowing which natural process to accelerate in the affected areas? a.precipitation b.erosion c.migration d.condensation

Hedgerows have created a new ecosystem within britain’s a. farms b. cities c. forests d. industrial areas