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Origin of LifeDirections:Grab a BioComm book from the shelf at the back of the room.Begin reading at What is Biodiversity? on page 430 at stop at the end ofpage 433.

Complete the reading guide.

What is Biodiversity?1. What does biodiversity mean? And what types of organisms does it

include?

2. What do the authors mean when they say, Each of us relates tonearly every other for of life on the earth either directly or indirectly?

What is the Origin of Our Present Biodiversity?1. Where does all life come from?

2. Describe or illustrate the environment conditions of prebiotic earth.

3. What do some scientists believe was the beginning of life on earth?What was this early life composed of?

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4. About__________________________________ years ago, the earliest forms oflife formed from the continued interactions of these macromolecules. These early __________________________________ cells are the geneticancestors of life on the earth.

5. Scientists hypothesize that the metabolic diversity that we see inmodern prokaryotes resulted in part from the effects of the earlyearths environment on the metabolic needs of the organisms.

What does the passage mean when it says metabolic needs? And howwould early earths environment affect an organisms metabolicneeds?

6. The atmosphere of early earth was composed of what 6 compounds?

7. Draw the evolution of the ancestral prokaryotic host cell to the presentday eukaryotic cell.

8. How did the ability to reproduce sexually enhance biodiversity?

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9. As _________________________________________________ made_________________________ available in the earths atmosphere, the first

______________________________ appeared, thei _____________________________ fueled __________________________________________ _________________________.

Early Plants and Animals1. When did vertebrates begin to evolve (what time period)? What was

the first vertebrate?

2. What land plants were common by the middle Devonian period?

3. During which period did the following organisms begin to formOrganism Time Period

1. Seed plants 1.

2. Reptiles 2.

3. Birds 3.

4. Mammals 4.

5. Flowering Plants 5.

Vocab Words to Define- You need two definitions for each word, the scientificdefinition and your own definition

1. Biota2. Preexisting Life3. Prebiotic4. Macromolecules

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5. Eukaryotic6. Endosymbiosis7. Blue-Green Algae8. Genotype9. Invertebrate (plus provide an example-name an invertebrate animal)

10. Vertebrate (provide an example- name a vertebrate animal)