Lillian wonders how fast a train can move around a particular curve before it falls off of the track. which of the following is the best way for lillian to figure this out?

a. drive a train along a curve at different speeds until it falls off of the track.
b. build a model train and track, and test one train going around one curve at different speeds.
c. build a model train and track, and test one train going around several different curves at one speed.
d. build a model train and track, and test different-sized trains going around one curve at the same speed.

B.Build a model train and track, and test one train going around one curve at different speeds.

Explanation:

If Lillian wants to know how fast a train can move around a specific curve before it falls off the track, she must build a model of train and track and through that model she will test a train traveling through a curve at different speeds. That way she can analyze in detail the phenomenon she wants to observe and get answers.

She should never drive a train along a curve at different speeds until it falls off the track, because that would be very dangerous and irresponsible. For this reason, models are great for people to be able to analyze phenomena and situations that would not be right to analyze in real life.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.  

the answer is b.) hydrogen bonds between bases.