Chapter 7 Flashcards Preview

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Flashcards in Chapter 7 Deck (16):
1

aerobic organisms

need oxygen

2

anaerobic

do not need oxygen

3

first cells

anaerobic prokaryotes: cyanobacteria

4

endosymbiosis theory

one cell engulfed a smaller cell and they developed a symbiotic relationship; ex: mitochondria in animal cells

5

Precambian Era

unicellular organisms, sponges, jellyfish

6

Paleozoic Era

oceans full of life, seed plants, amphibians then reptiles

7

Mesozoic Era

dinosaurs, small mammals, birds

8

Cenozoic Era

mammals flourish, primates and hominids appear

9

252 mya

Permian extinction takes out 90% of all species

10

3.5 bya

first prokaryotic cells appear

11

2.5bya

cyanobacteria create enough oxygen to create Earth's atmosphere

12

1.5 bya

first eukaryotic cells appear

13

.5 mya

first homo sapiens appear

14

the more precise method of dating

absolute dating

15

relative dating

does not provide exact age; depends on how deep the fossils were found in the ground to get an estimate

16

absolute dating

measures the decay of radioactive materials to provide an age in years