You are studying a mini-ecosystem that you created from samples of lake water, plants, and sediment. Your teacher tells you to drop about 10 sesame seeds on the top of the water because they will attract some interesting organisms. One week later, you
see that the seeds are surrounded by white fuzz that is extending off of the seeds, and you conclude that the decomposing seeds have been colonized by
A) diatoms.
B) brown algae.
C) unikonts.
D) water molds.
Answer: D
You might also like to view...
If you break your leg, the bone heals by forming a thickened area around the outside of the bone. Over a period of time, this thickened area:
B) is eaten away by osteoclasts. C) is digested by enzymes secreted by the muscles. D) forms new tendons, ligaments, and/or muscles. E) moves to the skin surface and is shed as dead skin.
Over the past 50 years, the atmospheric level of carbon dioxide has
a. decreased. b. increased slightly. c. more than doubled. d. stayed the same
Which of the following represents an early
stage in primary succession?
a. pine trees b. mosses and lichen of bare rock c. weedy annual plants in an open field d. climax species in succession e. fields of food crops
All EXCEPT which of the following
statements about Neanderthals is true? a. Neanderthals diverged from modern humans around 500,000 years ago. b. They lived in Europe and the Near East. c. Neanderthals are direct ancestors of Homo sapiens. d. Neanderthals brains were larger than those of modern humans. e. They have no modern descendents.