Respiration returns oxygen

to the atmosphere.

A human impact on the nitrogen cycle, such as fertilizer

What are stacks of flattened sacs that contain the pigment chlorophyll called?

Skeletal muscle fibers are classified as ""fast"" or ""slow"" based upon what factor?

Which is the site of protein synthesis? nuclear pore endoplasmic reticulum chromatin nucleolus

The current conditions of precipitation and temperature make up what

Why is the equator warmer than the north and south pole

Recognize and use signal words, Assignment Signal words let you know what's coming next in a sentence. Signal words show relationships between ideas. Use the drop-down menus to identify the signal words in each sentences.

Which processes are caused by convection currents in the mantle? Check all that apply. 1. earthquakes 2. ridge push 3. tsunamis 4. slab pull 5. volcanic eruptions 6. subduction

Imagine that you are studying the food preferences of a lizard species across its range. you have hypothesized that because these populations are fairly separate from one another, the lizards have evolved different food preferences.

An animal cell (left) and a plant cell (right) are shown. Which organelle labeled x in the diagram is found in both plant and animal cells