Two piers, A and B, are located 105 km away from each other along a river. A motor boat, with a speed of 40 km/hour in still water, is cruising between the two piers. How much time, t (in hours) will the motorboat need to get from pier A to pier B and back, if the speed of the current is 5km/hour?

Panthers and leopards prey on deer in an ecosystem. for unknown reasons, the population of leopards increased drastically. what are the likely effects of this change on the species? 1. more food for panthers and more competition for leopards 2. less food and more competition for panthers 3. fewer deer and more competition for panthers 4. more food for deer and less competition for panthers and leopards 5. more food for leopards and less competition for panthers

In this food web, which group would increase in number if snakes were eliminated? a. producers b. decomposers c. primary consumers d. secondary consumers e. tertiary consumers

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