Mammals that lay eggs are called

Mammals that have partial development in a pouch are called

Mammals that have complete development inside the uterus are called

How does carbon enter plants?

What are 2 ways that consumers return carbon to the atmosphere?

The process that holds heat in the atmosphere and keeps the earth warm is called

Excess carbon dioxide in the atmosphere can lead to

Nitrogen is essential because it is a key component of

All of the following are ways nitrogen is made available to plants except

The amount of energy available as it moves up a food chain

Why does energy decrease as it moves up an energy pyramid?

Plants transport water through a type of vascular tissue called

Plants transport food through a type of vascular tissue called

Many animals transport needed materials through

Plants excrete waste through

Transpiration is

The overall goal of respiration is to

Single-celled organisms such as bacteria and protists take in gases by

Plants are autotrophs because they obtain their nutrients through

Spores are advantageous because they are reproductive structures

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