Match the time frame listed on the left with the characteristic listed on the right.
Paleozoic era
?
Age of the dinosaurs
?
Mesozoic era
Most of Earth a desert
End of the
Mesozoic era
?
A layer of iridium
deposited all over Earth

Match each description to the appropriate biome. tropical savanna desert tropical rain forest taiga tundra has sparse vegetation and very cold temperatures located near the equator and contains trees that form dense canopy layers is very hot and dry, and has plants that need little water has cold winters, heavy snowfall and is dominated by conifers has warm temperatures and is dominated by grasses

2. sketch the inside of the bean nodule, and describe or label what you observed with the hand lens.

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons