Which of the following statements is a hypothesis rather than a theory?
A) Living things are made of cells.
B) Female birds prefer to mate with male birds that have longer tails.
C) Modern organisms descended from preexisting life-forms.
D) Matter is composed of atoms.
B
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The membrane that surrounds the central vacuole is the ____
a. chloroplast b. tonoplast c. chromoplast d. amyloplast e. ionoplast
An ecosystem is a community of ____ producers and ____ consumers that interact with one another and with their nonliving environment
a. energy-consuming; energy-producing b. primary; secondary c. autotrophic; heterotrophic d. heterotrophic; autotrophic e. nutrient cycling; heat producing
Three or more spindle poles present during mitosis of actively dividing cancer cells causes ________
Fill in the blank with correct word.
If Sry protein were injected into a genetic female fetus 6 weeks after conception, the fetus would develop into a genetic
a. female with ovaries. b. female with testes. c. female with neither testes nor ovaries. d. male with ovaries.