The study of how organisms interact with each other and with their physical environment is referred to as ____
Help with this statement, please?
Answer: ecology
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Select all of the following that represent examples of taxis.
_____ In the Northern Hemisphere, Aquaspirillum bacteria burrow towards the magnetic north pole (the geographical south pole). _____ Cyanobacteria filaments in an intertidal environment migrate upward if salinity falls below 15% and downward if it rises above 15%. _____ Mammalian spermatozoa are guided toward an oocyte by a temperature gradient between the cooler sperm storage site and the fertilization site. _____ Human body lice change direction more frequently as the temperature of their immediate environment increases.
What is the role of the villi?
A) To absorb small nutrient molecules from the digestive tract B) To move food along the digestive tract C) To secrete digestive enzymes into the digestive tract D) To secrete water into the digestive tract
Which of the following is true of a cell membrane?
A. They allow all substances to pass B. It's selectively permeable C. Cell membranes surround plant, animal, and bacteria cells D. It's a bi-layer composed of phospholipids and proteins
Parasitism is one of the most widespread life strategies ever to evolve. Which of the following is consistent with this finding?
A) Parasites almost always predigest their hosts' tissues and, therefore, spend less energy and require fewer structural adaptations. B) Parasites, unlike predators, feed on almost all the tissues of their host. C) Parasites do not generally kill their hosts; thus they can feed on the same host throughout the host's normal life span and do not have competition from decomposers. D) Parasites generally kill their host and can feed for a very long time because they are much smaller than their host.