A. create | B. deal | C. effect | D. major | E. producers |
● Earthworms are doing their part
Do you know that earthworms (蚯蚓) help to make healthy soil? Many scientists think they play a role in growing our food. New research has found that the animals help grow 65% of the world's rice. They make themselves one of the world's greatest rice .
How do the earthworms have the on soil? Worms make soil healthier by eating dead plants. As they eat the plants, they make something other plants need in order to grow. Worms also help soil keep water, and their movements tunnels that help plants grow roots.
However, some scientists believe other living things in the soil can also do the similar things as the earthworms. They think more research is needed.
A. different | B. experiment | C. respond | D. successfully | E. survive |
● Wild elephants can solve puzzles
Recently scientists have found that wild elephants can solve puzzles with no training after the elephants in zoos were seen solving problems.
Researchers at a wildlife area in Thailand set up puzzle boxes with three compartments (间隔). Each compartment was filled with jackfruit and opened in a way. By using cameras, the scientists watched 77 Asian elephants to see what they would do. By the end of the , they found that 11 elephants were able to get the fruit from one compartment, eight got into two compartments, and five solved all three puzzles to get the treats.
Elephants that returned to try the boxes several times had the most success. Researchers say the ability to solve problems can help the animals in changing environments. And understanding how they do this could help scientists protect them in a better way.
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