Answer:
B. never be used when driving
Answer:
Birds, like mammals, have a 4-chambered heart (2 atria & 2 ventricles), with complete separation of oxygenated and de-oxygenated blood. The right ventricle pumps blood to the lungs, while the left ventricle pumps blood to the rest of the body.
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Answer:
Stem
Explanation:
roots are underground and support the stem abd the stem hold up the leaves or flower buds and grows upwards as those branch off of the stem
The three categories of forests are separated into temperate, tropical, and boreal.
Answer:
the climate has cooled
Explanation:
the cenozoic era was much warmer than it is today