Historically, gastric ulcers were thought to be caused by stress. Recent medical discoveries now link gastric ulcers to
A) diet.
B) age.
C) a bacterial infection.
D) a viral infection.
Ans: C) a bacterial infection.
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Some species of insects are able to walk across liquid water because of the:
A. high specific heat of water B. low gravitational effect of their body weight relative to the amount of water C. higher density of liquid water compared to solid water D. capacity of water to function as a solvent E. high surface tension of water due to its cohesion
Are all fungi detrimental (bad) for other organisms?
A. Yes-think of molds that destroy plant crops, or fungal infections that cause athlete's foot. All fungi are bad for organisms they colonize. B. Yes-fungi feed directly on organic material (oftentimes killing it or feeding on it after the original organism has died). As such, they are always bad for other organisms. C. No-fungi are sometimes good, sometimes bad for other organisms. It really depends on which fungus you're talking about and the relationship it has with the other organism. Some fungi, for example, can form a symbiotic relationship with plant roots that increases their nutrient and water absorption. This is good. D. No-fungi are ALWAYS good when they interact with other organisms. There's never a downside or negative aspect to such interactions. Both sides always benefit from the relationship.
Answer: c
Which is an example of temporal isolation?
A. Two plant species have incompatible gametes. B. Two plant species live on the same mountainside, but one lives on rocky outcrops and the other in open meadows. C. One plant species blooms in June-July, and a second plant species blooms in August-September. D. One plant species is pollinated by bees and a second plant species is pollinated by moths.