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
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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
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)
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.
The segments of a transmembrane protein that cross the lipid bilayer usually consist of:
What will be an ideal response?