⁣Cornea: The cornea is the clear outer part of the eye's focusing system located at the front of the eye. Iris: The iris is the colored part of the eye that regulates the amount of light entering the eye. Lens: The lens is a clear part of the eye behind the iris that helps to focus light, or an image, on the retina.

⁣Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. The goal of every living organism, including plants, is to create offspring for the next generation. One of the ways that plants can produce offspring is by making seeds.

⁣Adult animals that have soft, elongated, often tubelike bodies and that lack backbones are commonly called worms. Worms are so different from one another that zoologists do not cl****ify them together in a single group; they place them in about a dozen different and often unrelated taxonomic groups called phyla.

⁣Anatomy is the science of understanding the structure and the parts of living organisms. Physiology, on the other hand, deals with the internal mechanisms and the processes that work towards sustaining life. These can include biochemical and physical interactions between various factors and components in our body.

⁣electric circuit, path for transmitting electric current. An electric circuit includes a device that gives energy to the charged particles constituting the current, such as a battery or a generator; devices that use current, such as lamps, electric motors, or computers; and the connecting wires or transmission lines.

⁣Complete and incomplete metamorphosis are two types of growth forms in insects. The complete metamorphosis occurs through four stages: egg, larva, pupa, and adult. The incomplete metamorphosis occurs through three stages: egg, nymph, and adult. The pupa stage is not developed during incomplete metamorphosis.

⁣The kingdom Animalia is the most evolved and is divided into two large groups - vertebrates and invertebrates. These animals are multi-celled, heterotrophic eukaryotes with aerobic respiration, sexual reproduction and the ability to move.

⁣Definitions of body waste. waste matter (as urine or sweat but especially feces) discharged from the body. synonyms: excrement, excreta, excretion, excretory product.

⁣Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers.

⁣The ear is a sensitive organ of the human body. It is mainly concerned with detecting, transmitting and transducing sound.

The solar system consists of the Sun and everything that orbits, or travels around, the Sun. This includes the eight planets and their moons, dwarf planets, and countless asteroids, comets, and other small, icy objects. However, even with all these things, most of the solar system is empty space.

⁣“Biodegradable” refers to the ability of things to get disintegrated (decomposed) by the action of micro-organisms such as bacteria or fungi biological (with or without oxygen) while getting ****imilated into the natural environment.

⁣A parallel circuit comprises branches so that the current divides and only part of it flows through any branch. The voltage, or potential difference, across each branch of a parallel circuit is the same, but the currents may vary.

⁣A food web consists of all the food chains in a single ecosystem. Each living thing in an ecosystem is part of multiple food chains. Each food chain is one possible path that energy and nutrients may take as they move through the ecosystem.

⁣A simple series circuit is designed with one load resistance and only one battery, in which the negative terminal of the component is joined with the positive terminal of the series combination. In the series circuit, the current p****es at an equal magnitude.

⁣The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart. The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.

⁣What is the digestive system? The digestive system is made up of the gastrointestinal tract—also called the GI tract or digestive tract—and the liver, pancreas, and gallbladder. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus.

⁣The respiratory system is the network of organs and tissues that help you breathe. It includes your airways, lungs and blood vessels. The muscles that power your lungs are also part of the respiratory system. These parts work together to move oxygen throughout the body and clean out waste gases like carbon dioxide.

4th grade science is fun with these review lesson videos from Homeschool Pop. This compilation features some of our most popular 4th grade science videos. We hope you enjoy them as much as we loved making them!

00:00 The human heart
5:19 Reptiles
10:46 Earthquakes
17:09 Plant parts and functions
27:40 Planets in our solar system
44:29 The human brain

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4th Grade Science Compilation

⁣A proportion is an equality of two ratios. The ratios in a proportion are equivalent ratios. Two ratios are equivalent if you can multiply or divide both numbers in one ratio by the same value to get the other ratio.