Answer:
Those parts have become vestigial
Explanation:
Organisms have few parts that are not useful to them because those parts in them have become vestigial.
When an organism has a part is no more using, it relates to the evolutionary history of such organism.
- These parts are called vestigial body parts.
- They are not needed for the survival of an organism again and they can do without them.
- At a certain point in time, those parts might be very vital to the sustenance of such organism.
- With time, those parts becomes useless and redundant.
Bandwagon advertising is basically persuading people to join something or buy something because, "everyone else is."
For example: "Vote for Charlie to be the class president! Everyone else is!"
Answer:
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Explanation:
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Answer:
younger than 50,000 years and older than 100 years
Explanation:
Carbon-14 is produced in the upper atmosphere when cosmic rays bombard nitrogen atoms. The ensuing atomic interactions create a steady supply of c14 that rapidly diffuses throughout the atmosphere. Plants take up c14 along with other carbon isotopes during photosynthesis in the proportions that occur in the atmosphere. animals acquire c14 by eating the plants (or other animals). During the lifetime of an organism, the amount of c14 in the tissues remains at an equilibrium since the loss (through radioactive decay) is balanced by the gain (through uptake via photosynthesis or consumption of organically fixed carbon). However, when the organism dies, the amount of c14 declines such that the longer the time since death the lower the levels of c14 in organic tissue. This is the clock that permits levels of c14 in organic archaeological, geological, and paleontological samples to be converted into an estimate of time.
half-life of radiocarbon is actually 5730 ± 40 years
<u>Since there are practical limits to the age range of the method, most samples must be younger than 50,000 years and older than 100 years.</u>
Describing motion from each frame of reference:
Since observer A is on one of the train's cars, he will find that he is at rest with respect to the train even when it is pulling away because, he is also moving with respect to the train.
Observer B on the stationary platform will observe that the train is pulling away from the station towards the right of the platform. as is described
Observer C will notice that the train is approaching him in the opposite direction at a speed which is the sum of the speeds at which both the train are traveling
If the conductor applies brakes on the train, since the platform is a stationary frame of reference. The motion will be observed as a simple decelerationg. he will observe that the force due to the brakes will cause the velocity of the train with respect to the train to decrease
Universal law of gravitation effects all objects alike . There will be a constant force of gravity acting on the train that will keep the train on its tracks. The tracks in turn exert a reaction force on the train. There will not be any affect on the train's motion as such( assuming that the train is moving along the tracks and gravitational force is exactly perpendicular)
