How do ecologists estimate the total number of species present in the world? How is it possible that the largest animals on the planet live in the oceans? There are about how many species of protists currently identified? A. 10 billion B. 1,000 C. 10 million D. 1 million E. 100,000...
Whales can be difficult to study due to the fact that many species live deep in the ocean, hundreds of feet below the surface.Sperm whalesspend much of their time diving deep in search of food. They can reach depths of 3,000 or more feet, which is a little more than a half-mile. ...
Third, there is the possibility that the agnostids were parasites, living on and feeding off larger organisms. One reason that this seems possible is that there are many species of modern-day arthropods that exist as parasites, such as fleas,ticks, and mites. The agnostids might have lived on...
It is a natural process of animal species to become extinct (e.g. dinosaurs, dodos etc.). There is no reason why people should try to stop this from happening. Do you agree or disagree? Give reasons for your answer and include any relevant examples from your own knowledge or experience....
How many invasive species are there in the world? Invasive Species: Species are introduced to new ecosystems frequently, especially with the help of humans moving from place to place. Some of these invasive species are benign and have little effect, while others can devastate biomes. ...
The exact number of fish that live in the twilight zone is unknown, but there are several hundred identified species and a total of over 700... Learn more about this topic: Ocean Depth Zones | Overview, Characteristics & Layers from
Starfish live on the ocean floor. They move very slowly. How do starfish move? A. They walk on legs. B. They swim like fish. C. They crawl on the bottom. D. They fly in the air. 相关知识点: 试题来源: 解析 C。本题考查对海星移动方式的了解。海星在海底爬行,A选项海星没有腿走路;...
Sometimes people pollute the water or overfish, so the w___ (81) that all the living things are joined together has been changed. If coral reefs get hurt, many animals have to find new homes. Some animals’ n___ (82) drop low, and some animals just disappear. Mr...
There are more than 40 types of dolphins, yet the number continues changing as science studies these warm-bloodedmarine animals. Most dolphins are important for the Delphinidae family, which remembers those living for the sea, yet some different species live in streams and have an alternate ordere...
How many species rely on coral reefs? Coral Reefs: Coral reefs are structures which are made up of the skeletons of coral. Coral, which is a living animal, uses calcium carbonate to build its skeleton. This builds up slowly, over time, and when many corals live together in a colony, a...