Many ferns live on other plants without
withdrawing nutrients from them. These ferns
are said to be
a. epiphytes.
b. bryophytes.
c. parasites.
d. pathogens.
e. saprophytes
A
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Typically, flower color and shape are associated with what type of selective pressures?
a. natural selection b. mutation c. sexual selection d. evolution
Occasionally the testes do not descend into the
scrotum as they should in a newborn. If this is not corrected surgically, a. sperm production will be affected. b. achieving an erection will not be possible. c. the child will have female characteristics. d. growth will be stunted. e. the child will not live.
Four small bags are filled with a 10% starch solution. The membrane of each bag contains microscopic pores large enough to let smaller water molecules cross but too small for the larger starch molecules to cross
Each bag is placed in a separate beaker as follows: Bag 1 is placed in distilled water containing no starch (0% starch). Bag 2 is placed in a solution of distilled water and 5% starch. Bag 3 is placed in a solution of distilled water and 10% starch. Bag 4 is placed in a solution of distilled water and 50% starch. The bags are weighed initially and at regular intervals for a specific period of time. Some bags saw a change in weight, and some did not. Answer the following questions based on the expected outcomes of this experiment. a. Which bag should weigh approximately the same at the end of the experiment as it did at the beginning of the experiment? b. Which bag is expected to be the heaviest at the end of the experiment?
Which of the following features do both plant and animal cell possess?
A. Cell walls B. Chloroplasts C. Plasma membrane D. Centrioles