How many species do these 10 different birds represent?

The activity of the modern sample is 1.10 bq . how long does that measurement take?

18. over time, how do sand dunes tend to migrate? a. perpendicular to the movement of the wind b. in the same direction as the wind blows c. toward the wind d. in random directions

Anormal strand of dna is shown below, followed by the same strand of dna after mutations have occurred.