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A structure or behavior that helps a plant or animal live in its surroundings.
A marine or freshwater plant or plant-like organism that usually contains chlorophyll.
To study or determine the nature and relationship of the parts, suggest separating or breaking down the parts of something to understand its true nature.
Plants that complete their life cycles in one growing season.
Lacking in rainfall, very dry.
The layer of gases, like air, that surrounds the Earth.
A low, bowl-shaped area of land surrounded by higher lands.
A community of plants and animals living together in a particular climate.
A type of tree with wide, flat leaves.
A gas in air that is taken in by plants, exhaled by animals, and given off when fuel is burned.
The metric temperature scale where 0 degrees is assigned to the temperature where water freezes, and 100 to the temperature where water boils.
A unit of length in the metric system. It takes 2.54 of these to make an inch.
A green pigment found in plants, necessary for conducting photosynthesis.
To arrange in groups according to specified similarities.
The average weather conditions of an area over many years, as measured by temperature, wind speed, and precipitation.
The whole group of plants and animals that interact in a common location.
The active demand by two or more organisms, such as plants, for some environmental resource in short supply.
To preserve, or to avoid wasteful use.
To show a relationship between things.
One of a group of trees that lose their leaves in the fall.
Inactive or asleep, but capable of waking up; not actively growing, but protected from the environment.
A period of dryness, that when prolonged, causes damage to crops; a shortage of water.
The height of a place above sea level.
The surroundings in which a person, plant or animal lives, including the air, water, and land.
An organism that grows on another organism. The two organisms do not take nutrients from or give nutrients to each other.
An imaginary circle around the Earth that lies halfway between the North Pole and the South Pole.
To change from a liquid to a gas.
A plant that stays green all year, including firs and pines.
To change back and forth uncertainly.
An organism that grows from spores, not seeds, usually classified as a plant without chlorophyll, such as mold, mildew, mushrooms, and yeast.
The time of the year when crops grow.
An educated guess; a likely explanation for a problem.
To separate to prevent transfer of electricity, heat, or sound.
To observe or study closely.
Shapes, like mountains or hills, that make up the Earth's surface.
Imaginary lines on a map or globe that measure distance in degrees north or south of the equator. These lines extend horizontally, from east to west on a globe.
Imaginary lines on a map or globe that measure distance in degrees east or west of the prime meridian. These lines extend vertically, from pole to pole on a globe.
A unit for measuring length in the metric system. There are 10 mm in 1 cm, and 1,000 mm in a meter.
A type of tree with long, thin leaves.
A material that plants and animals need to live and grow.
A living being.
A gas that is given off by plants and used by animals.
Plants that complete a growing cycle each year for several years.
The process by which plants use light, carbon dioxide, and water to make food.
A large area of flat or nearly flat land.
Flat land covered with tall grass and wildflowers.
Moisture that falls to the ground from clouds; includes rain, snow, sleet, and hail.
Most frequent or most common.
Something about an organism or object that can be observed, such as size or shape; characteristics common to all members of a group.
To bend or fold back, to change direction.
A large area with common features that set it apart from other areas.
Something that is useful.
A thick layer of soil.
A group of organisms having common attributes and given a common name.
A flat, dry plain covered with short grass.
Living together in a way that benefits both individuals.
The degree of hotness or coldness of a substance as measured by a thermometer.
To flourish or grow vigorously.
To put up with, endure, or withstand.
Plant life of an area.