One season, there was a shortage of producers in a food web. as a result, the number of deer and wolves decreased. what is the reason that both the deer and wolf populations declined?
a) in a food web, populations of producers and consumers tend to remain constant.
b) in a food web, more consumers than producers are needed to keep energy cycling.
c) in a food web, producers are not as important as consumers.
d) in a food web, the population of producers affects the population of consumers.

"your temperature analysis reveals a pattern with coldest temperatures located to the portion of the map."

Scientists are conducting a study on the effectiveness of a new drug on memory loss. they are giving some of the test subjects the new drug to find out if it improves their long-term memory. which are possible limitations of this study? check all that apply. a) test subjects may want to participate in additional experiments. b) test subjects may think they should be paid more. c) test subjects may get bored and want to quit early. d) test subjects may have to travel during the experiment. e) test subjects may have full-time jobs. this is multiple choice. you for the !

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas