Olivia is entering a competition to build a device that automatically feeds fish every day. The device should not contain any materials
that may be toxic to fish.
Is this a criterion or a constraint?

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?