What is the best definition of an organ?

A. A single type of tissue
B. A type of glandular tissue
C. Two or more tissues working together to perform a specific task
D. Muscle tissue that has differentiated from stem cells
E. A collection of cells and interstitial fluid


Answer: C

Biology & Microbiology

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One hypothesis proposes that an asteroid impact at the end of the ___________ led to the extinction of dinosaurs. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

Phenotype is ____

a. only expressed in a heterozygous organism b. an observable property or expression of a trait in an organism c. the specific genetic constitution of an organism d. the variation of genes e. cannot be determined by knowing genotype

Biology & Microbiology

A flood that separates a population of frogs onto opposite sides of a lake is an example of a vicariance event that may result in allopatric speciation.

Indicate whether the statement is true or false.

Biology & Microbiology

The segments of a transmembrane protein that cross the lipid bilayer usually consist of:

What will be an ideal response?

Biology & Microbiology