Bright hotel lights pull sea turtle hatchlings away from the ocean at night, and the hatchlings need to reach the water. Plan A turns the beach lights off at night. Plan B paints the hotel walls a lighter color. Which plan is better?

A stream warms up after the trees along its bank are cut down, and the trout there need cooler water. Plan A adds more trout to the stream. Plan B plants shade trees along the bank. Which plan is better for the trout?

A town builds a fish ladder so salmon can swim past a dam to the stream where they lay eggs. What evidence would show the fish ladder is working?

A meadow is mowed so often that the wildflowers bees feed on never bloom, and the bees need flowers for food. Plan A leaves part of the meadow unmowed until fall. Plan B mows the meadow at night. Which plan helps the bees?

Deer eat every young tree in a replanted forest, and the seedlings need to grow tall before they can survive. Plan A waters the seedlings twice a week. Plan B puts a wire fence around each seedling. Which plan meets the seedlings' need?

A city digs a tunnel under a busy road so toads can cross to their breeding pond. What evidence would best show the tunnel is working?

A long drought dries up the pond where a park's ducks drink, and the ducks need water. Plan A digs a small pond filled from a well. Plan B builds a picnic shelter beside the dry pond. Which plan is better for the ducks?

Plastic bags blow from a beach into the sea, where turtles swallow them and get sick. Plan A paints turtle pictures on the boardwalk. Plan B puts covered lids on every beach trash can. Which plan is better for the turtles?

A builder puts up a silt fence so mud stops washing into the creek where fish lay their eggs. What evidence would show the silt fence is working?

The old barns where a town's bats roosted have been torn down, and the bats need safe places to rest by day. Plan A puts up wooden bat boxes on tall poles. Plan B leaves out dishes of fruit at night. Which plan is better for the bats?

A thick water weed spreads over a pond and blocks the sunlight the pond plants below need. Plan A stocks the pond with more fish. Plan B rakes the weed off the water each spring. Which plan meets the pond plants' need?

Birds keep flying into the wide glass windows of a new school, and they need to see that the glass is not open sky. Plan A sticks patterned dots across the glass. Plan B washes the glass every week. Which plan is better for the birds?

Salt spread on a road washes into a marsh and harms marsh plants that need fresh water. Plan A widens the road. Plan B spreads sand instead of salt on icy days. Which plan is better for the marsh plants?

A town plants milkweed along a trail so monarch caterpillars have the leaves they eat. What evidence would show the planting is working?

People walking on a beach step close to shorebird nests, and the nesting birds need to be left undisturbed. Plan A ropes off the nesting area all summer. Plan B hands out beach umbrellas. Which plan meets the birds' need?

So much pond water is pumped onto lawns that the pond is shrinking, and the fish there need deeper water. Plan A adds a fountain to the pond. Plan B limits lawn watering to two days a week. Which plan is better for the fish?

After a fire, a park plants young pines so squirrels have trees to nest in again. What evidence would show the planting is helping the squirrels?

Fast boats in a warm bay injure manatees that must swim up to the surface to breathe. Plan A sets a slow-speed rule for boats in the bay. Plan B builds another boat dock. Which plan is better for the manatees?

A tall fence stops a pronghorn herd from reaching the winter grass it feeds on. Plan A sets a water tank beside the fence. Plan B lifts the bottom wire so the herd can crawl under. Which plan meets the herd's need?

Waste from a factory makes a lake's water unsafe for the fish living in it. Plan A cleans the water before the factory lets it out. Plan B puts more fish in the lake every spring. Which plan is better for the fish?