Julia spent $50 on a book. The cost of the book was $20 less than twice what she spent on a backpack. How much did the backpack cost?

Where on earth can ecological relationships be found

True or False, DNA is not always available in a hair sample.

Two more than three times a number equals 30.

Which of the following is likely to cause a quick change to the earths surface sand dunes canyons deltas landslides

Which of the following organs is part of the respiratory system? lungs heart skin stomach

The United States uses which source of energy to produce almost 40 percent of its electricity? A. solar B. water C. biomass D. wind E. coal

Which cell breaks down carbohydrates

What characteristic distinguishes the five groups of fungi?

A research colleague has provided you with a single cell to identify. briefly describe the steps you would take to determine which domain this cell would most likely belong to.

A new organism is discovered in the forests of Costa Rica. Scientists there determine that the polypeptide sequence of hemoglobin from the new organism has 72 amino acid differences from humans, 65 differences from a gibbon, 49 differences from a