Q81: The dolphin is a fish that breathes with gills.
Answer: False ✖
💡 The dolphin is a mammal; it breathes air with its lungs and nurses its young. It is not a fish.
243 questions and answers — page 5 of 13
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Answer: False ✖
💡 The dolphin is a mammal; it breathes air with its lungs and nurses its young. It is not a fish.
Answer: A huge bloom of tiny algae in the water
💡 When certain tiny algae multiply rapidly, they can color the water and use up the oxygen or release toxins that harm sea life.
Answer: The octopus
💡 The octopus has 8 arms covered with suckers, and it quickly changes the color of its skin to look like the rocks and sand around it.
Answer: The Great Barrier Reef
💡 The Great Barrier Reef stretches for thousands of kilometers off northeastern Australia and includes thousands of reefs and small islands.
Answer: Because rivers and rain carry salts from rocks to it, then the water evaporates and the salt remains
💡 Flowing water dissolves small amounts of salt from rocks and carries it to the sea, and when seawater evaporates the salt stays behind and builds up over a long time.
Answer: The moon's gravity
💡 The moon pulls on the seas' water, so it rises and falls regularly every day; the sun has a smaller effect.
Answer: Because salt water is denser
💡 Dissolved salts increase the water's density, so salt water pushes objects upward with greater force.
Answer: Stinging cells in its tentacles
💡 A jellyfish's tentacles have stinging cells that fire tiny venomous needles to paralyze its small prey.
Answer: The squid
💡 The squid releases dark ink that confuses the predator and blocks its view, then takes the chance to escape.
Answer: A new tooth grows in its place
💡 Sharks have rows of spare teeth, so whenever a tooth falls out, another moves forward to take its place.
Answer: It sticks to their feathers so they can no longer keep them warm or afloat
💡 Oil-soaked feathers stick together and can no longer trap warm air, so the birds get cold and cannot float or fly.
Answer: In ice and glaciers
💡 Most fresh water is frozen in polar ice and glaciers, followed by groundwater, while rivers and lakes hold only a small share.
Answer: In the seas and oceans
💡 Most of Earth's water is salt water in the seas and oceans, and fresh water is only a small part of it.
Answer: Carbon dioxide
💡 The more carbon dioxide there is in the air, the more the seas absorb, making them more acidic, which harms coral and shells.
Answer: Mangrove trees (qurm)
💡 Mangrove trees tolerate salt and grow in shallow water; their roots protect the shores and shelter young fish.
Answer: The sea anemone
💡 The clownfish's body is covered with mucus that protects it from the sea anemone's stings, so it shelters among them from its enemies.
Answer: The dugong (sea cow)
💡 The dugong is a gentle marine mammal that feeds on seagrass in shallow water, and it is an endangered species that needs protection.
Answer: A predator
💡 A predator hunts its prey, like a shark hunting fish, while a herbivore eats only plants.
Answer: They break down the remains of dead organisms and return their elements to the environment
💡 Decomposers break down the remains of dead organisms so their materials return to the soil and water, where producers can use them again.
Answer: A producer
💡 Plants and algae are producers because they make their food by photosynthesis, while animals are consumers that eat other living things.