If a species is absent from a particular region, which are the reasonable explanations for its absence? Check all that apply.

_____ It evolved elsewhere and never dispersed to the region in question.
_____ It was once found in the region in question, but became extinct there due to climactic changes.
_____ It was once found in the region in question, but migrated to other regions
_____ It was once found in the region in question, but was eradicated by humans.


__X__ It evolved elsewhere and never dispersed to the region in question.
__X__ It was once found in the region in question, but became extinct there due to climactic changes.
__X__ It was once found in the region in question, but migrated to other regions
__X__ It was once found in the region in question, but was eradicated by humans.

Biology & Microbiology

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In lateral growth, the _________ is the source of new xylem and phloem, whereas the _________ renews and maintains the outer layer that protects the stem

A. cork cambium; vascular cambium B. vascular cambium; cork cambium C. secondary vascular tissue; primary vascular tissue D. sapwood; heartwood E. apical meristem; lateral meristem

Biology & Microbiology

The first information storage molecule was probably ____

a. DNA b. RNA c. protein d. carbohydrates e. lipids

Biology & Microbiology

An opening in leaves that functions in the exchange of gases is called a ____.

A. cuticle B. stoma C. guard cell D. pit E. pore

Biology & Microbiology

Which of the following pathways are operational in a cell growing via fermentation?

A) glycolysis, intermediate step, and the Krebs cycle B) glycolysis and intermediate step only C) glycolysis D) intermediate step E) Krebs cycle

Biology & Microbiology