The Cambrian Explosion Occurred Primarily in the Oceans

question 31

Multiple Choice

The Cambrian explosion occurred primarily in the oceans.Which of the following were the first challenges that had to be overcome during the mass colonization of dry land in the Ordovician period?

• A)support of body structure without buoyancy in water,movement,and reproduction
• B)photosynthesis,cellular respiration,and reproduction
• C)DNA replication,photosynthesis,and cellular respiration
• D)DNA replication,phagocytosis,and cellular respiration

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Definitions:

Bipolar Disorder

A psychological disorder marked by significant fluctuations in mood, ranging from periods of intense happiness (mania or hypomania) to profound sadness (depression).

Schizophrenia

A chronic brain disorder characterized by symptoms such as delusions, hallucinations, disorganized speech, and impaired cognitive ability.

Generalized Anxiety Disorder

A mental health disorder characterized by persistent and excessive worry about different aspects of life.

Excessive Anxiety

A state of persistent and overwhelming worry and fear that is disproportionate to the actual source of stress in one's life.