Counting the number of organisms in a small area and multiplying to estimate the number in a larger area is called

a.

direct observation.

b.

mark and recapture.

c.

population density.

d.

sampling.

There is a large box and a small box on a table. The same force is applied to both boxes. The large box moves two feet and the small box moves one foot. Which movement shows the most work done

when a man travel from hilly region to terai region what will happen to his weight? explain with reason.

The period of the musical node E0 is 4.85 * 10-2 seconds. What is the frequency of this note? Select one of the options below as your answer:. A. 10.8 hertz. B. 20.6 hertz. C. 40.8 hertz. D. 48.5 hertz. E. 80.9 hertz

A bicyclist bikes the 56 mi to a city averaging a certain speed. The return trip is made at a speed that is 6 mph slower. Total time for the round trip is 11 hr. Find the bicyclist's average speed on each part of the trip.

In which layers would a solid cube with 6 cm sides and a mass of 270 g float? Explain.

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are

How much force would be needed to move a car with the mass of 100kg to an acceleration of 5m/s/s?

A pendulum bob is made from a sphere filled with water. What would happen to the frequency of vibration of this pendulum if the sphere had a hole in it that allowed the water to leak out slowly?

Elias serves a volleyball at a velocity of 16 m/s. The mass of the volleyball is 0.27 kg. What is the height of the volleyball above the gym floor when its total mechanical energy is 41.70 J? Round to the nearest number.

Which of the following is the best description of a graph? A. Equations that can be plotted B. A representation of an equation C. Independent and dependent variables D. x and y lines