With respect to plant reproduction, there has been an evolutionary trend toward
A) greater seed production.
B) larger fruits.
C) sporophyte prominence.
D) smaller flowers.
E) increased pollen production.
C
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A student poses the question: How does the presence of dissolved salt affect the freezing point of water? To answer this question, the student set up two conditions. In the first condition, the student added salt to water in a container and referred to this condition as the variable. In the second condition, the student did not add any salt to water in a second container and referred to this
condition as the control. The student took both containers and attempted to freeze the water at various temperatures to assess the freezing point. Would this be a valid experiment? A. Yes, because there is more than one variable. B. Yes, because there is one variable and a control C. No, because there is not more than one variable D. No because there is only one variable and a control
The ____________________ are the dead end sacs involved in gas exchange. Fill in the blank(s) with the appropriate word(s)
A region of a chromosome on spanning the centromere is broken and reattached in the reverse direction. This is an example of which type of chromosomal defect?
A) paracentric inversion B) pericentric inversion C) pericentric translocation D) dicentric inversion E) dicentric translocation
What cycle does a female dog undergo, and what does the cycle lack?
a. an estrous cycle, which lacks ovulation b. an estrous cycle, which lacks menstruation c. a menstrual cycle, which lacks ovulation d. a menstrual cycle, which lacks implantation