When two salamander species, the red-backed salamander and the valley-and-ridge salamander, occur without the other present, their jaw structures are identical, and they consume the same prey. however, when the two species co-occur, the red-backed salamander has a slower-closing, stronger jaw, while the valley-and-ridge salamander has a faster-closing, smaller jaw, and the two species consume prey of different sizes. which of the following is suggested by these observations?

(a) competitive exclusion
(b) preemptive competition
(c) a trade-off between growing fast and competing well
(d) character displacement

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

after making a punnet square using bv bv bv bv you will find that the ratio will be 9: 7 or a 128.6% probability.

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wild parsnip is a perennial plant which reproduces rapidly in areas which have no sign of agricultural activity such roadside or at no tillage open areas. it's considered invasive because it can inhibit the growth of another plant  and its reproduction is fast. there are several harmful effects of this invasive plant although its taproot is edible since it is a member of the carrot family. wild parsnips can cause skin blistering when in contact because of the chemicals it contains, second it inhibits the growth of other plants, it will restrict the growth of animals when eaten and lastly, it drives away natural pollinators like bees.