Ecosystems by:nick williams

How are living things connected

All living things need energy to survive.They get that energy by eating other animals or other plants. The parts of an ecosystem are connected by food chains and food webs. A food chain shows how energy flows from one living thing to another in an ecosystem. Just as in any chain, each link is connected to the next one. Each link in a food chain is a living thing. The order of the food chain shows what each living thing eats to survive. plants are the first link in a food chain. They use nonliving things to get there energy. they use air, water, and the energy from the sun to make their own food and to stay alive. Plant's are called producers because they produce their own food and energy. facts from theme reader page 326

Animals cannot make their own food like plants so they have to eat, or consume, food to get energy. All animals in a food chain are called consumers. Herbivores, Carnivores, and Omnivores are all types of consumers. Animals that eat only plants are called Herbivores. Herbivores follow plants in a food chain. facts in theme reader on page 327

Carnivores and Omnivores follow Herbivores in a food chain. Carnivores eat meat. A snake is one example of a Carnivore. It eats worms, caterpillars,frogs, mice, fish, and small birds. Omnivores eat both plants and animals. A small bird eats insects, spiders, and the seeds of plants so it's an Omnivore. How do animals know what to eat? Some animals are taught by their parents. Mammals, such as lions, bears, and wolves teach their young how to hunt for food. Their eating habits are learned. Other animals are born with knowledge about what to eat throughout their whole life. Most reptiles, such as turtles, snakes, and lizards, find their own food as soon as they are born. Their eating habits are inherited. Facts in theme reader on page 328.

What happens if there are changes in an ecosystem or if one thing is removed from the food web

A habitat is a place were plants and animals live. When a habitat changes,the plants and animals may have trouble surviving. Sometimes there can be a tiny change in the ecosystem and sometimes a huge change. People can also change a habitat when they turn land into farms or build towns with homes and stores where all the animals live. In China, for example, logging and farming have destroyed some of the giant Panda habitats. Habitats also are changed by natural causes, such as wildfires, volcanic eruptions, or hurricanes. facts in theme reader on page 340.

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