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What is an invertebrate? • Animals must get energy from eating plants or other animals. • Animals are classified according to whether or not they have a backbone. • Invertebrates have no backbone. • Some have a hard outer covering or shell (ex: insects, crabs) • Some do not (ex: jellyfish, spiders) What are vertebrates? • Vertebrates are animals with backbones. • Vertebrates have a protective skin covering, an inside skeleton, muscles, blood that circulates through blood vessels, and lungs or gills for breathing. • Vertebrates are divided into 5 groups: Fish: breathe with gills, have scales and fins, most lay eggs, have body temperature that changes with environment. Amphibian: spend first part of life breathing with gills in water, adults breathe with lungs on land, have smooth, moist skin, most lay eggs, body temperature changes with environment. example: frog Reptiles: breathe with lungs, have scales, or plates, most lay eggs, body temperature changes with environment. examples: alligator, turtle Birds: breathe with lungs, have feathers, a beak, two wings, two feet, lay eggs, and have a constant body temperature Mammals: breathe with lungs, have fur or hair, can nurse their young with milk, give birth to live offspring, have constant body temperature How do animals and humans use their senses? • Animals and humans have sensory organs that allow them to detect changes in the environment • When change is detected organisms respond with certain behaviors • Senses tell animals what they need to know about their environment Sensory organs are any part of the body that receives signals from the environment; they help keep them out of danger and enable them to find food and shelter How do animals and humans use their senses? • Animals and humans have sensory organs that allow them to detect changes in the environment • When change is detected organisms respond with certain behaviors • Senses tell animals what they need to know about their environment Sensory organs are any part of the body that receives signals from the environment; they help keep them out of danger and enable them to find food and shelter • Animals are born with instincts which allow them to survive. example: skunk’s ability to spray • Animals can acquire behavioral characteristics-usually in response to environmental condition and are a result of learning. example: a dog fetching a ball. All organisms cause changes in the environment where they live—some are harmful and some are helpful • Changes in the environment can lead to changes in the behavior of living things. • Organisms may compete for space, food, or resources if too many organisms are within the same environment and need the same resources. The number of organisms in an environment will increase or decrease depending on the availability of food and other resources