Green plants make their own food by a process called photosynthesis. They also use nutrients and water from the soil to grow. Primary consumers (insects, chipmunks, mice and deer) eat green plants.

Plants and animals that live in water create some amount of acid in the water. The carbon dioxide that plants and animals release into the water makes the water acidic and unsafe for living organisms. This is why the water of captive aquatic animals and plants must be changed often.

Baking soda can be used as an indicator of how much acid a substance contains. Lemons and limes have more acid in them than grapefruits and oranges. Indophenol can be used as an indicator of how much vitamin C is in a substance.

In the intertidal zone organisms are exposed to periods of varying moisture, sunlight, and wave forces. Many organisms have specialized structures or behaviors that allow them to live in this constantly changing and often harsh environment.

Artemia adult's blood circulation in the tail and appendages.

The Monarch butterfly is an insect and has six legs and two sets of wings. The butterfly drinks using a straw-like mouth structure.

After entering the pupal stage, the adult darkling beetle will emerge. The beetles can then mate and lay eggs, which will hatch into mealworm larvae.

The butterfly can fly around using its wings and sees where it is going through its eyes. The spiracles allow the butterfly to breathe and the legs are what it uses to walk or crawl around on. The antennae help the butterfly know where it is going. The proboscis is what the butterfly uses to drink nectar from flowers.

The female adult darkling beetle lays hundreds of eggs that eventually hatch into tiny mealworms (larval stage). Darkling beetles do not have live births.

The adult frog now lives on land and has nostrils and lungs to breathe air. It also has front and hind legs to hop around on. This frog can start the life cycle over again by laying eggs and reproducing.

Once milkweed bugs have grown into adults, they can mate and lay eggs. They tend to lay eggs on soft, protective material.

The adult zebra fish is the final stage in the zebra fish life cycle. At this point, the adult can lay eggs and a male zebra fish will fertilize them.

When a city is built, habitat and most organisms living in it are killed or forced to flee. Cities use a lot of energy and water and create a tremendous amount of waste and runoff. Development is the biggest source of pollution.

Science in its earliest beginnings consisted of a practice called alchemy. Alchemy includes the study of chemistry, biology, astronomy, spirituality, physics, and art. Distillation or experiments in purification of substances may have been a part of the practice of alchemy.

Algae are a collection of a millions of photosynthetic protists. These algae are red because of a special pigment. They cement themselves onto rocks in moist areas.

Large amounts of nutrients from agricultural runoff and pollution cause increased growth of algae. Algal blooms cause other organisms to die because the algae uses up all the oxygen in the water to grow. Eventually, this body of water will have no life in it.

Algae are producers. This means that they make their own energy and food and do not need to eat other organisms to gain energy and live. Algae use the sun, water, and carbon dioxide to go through photosynthesis and make their own energy to grow, bloom, and reproduce.

This red algal cell (Chlamydomonas nivalis) gives mountain snow packs a red tint. It uses the pollutants in snow as food. It cannot be seen without a microscope.

Alligator weed is a non-native species of plant in the United States that can damage waterways by clogging them and reducing water flow. Also, it grows in a way that reduces light penetration into the water. Alligator weed is being reduced by a few different insects that were released as biological control agents, such as the alligator weed flea beetle.