An ecologist studies a forest area for evidence of competition among organisms. she chooses a specific location where a tree was struck by lightning. the lightning strike caused the tree to fall over, leaving a space in the tree canopy for light to pass through. which of these observations provides the best evidence of competition?

many tree seedlings crowd the open space and attempt to grow in the sunlight.

snakes come into the open space and eat small rodents that can easily be spotted in the sunlight.

termites, with microorganisms in their stomachs to them digest wood, are found on the fallen tree.

a type of plant, called a bromeliad, grows in the branches of the fallen tree and continues to survive even though the tree has fallen

Multiple choice. choose the one alternative that best completes the statement or answers the question. 1) if the force on an object is in the negative direction, the work it does on the object must be 1) a) negative. b) positive. c) the work could be either positive or negative, depending on the direction the object moves. 2) a truck has four times the mass of a car and is moving with twice the speed of the car. if kt and kc refer to the kinetic energies of truck and car respectively, it is correct to say that 2) a) kt = 16kc . b) kt = 1 2 kc. c) kt = kc . d) kt = 2kc . e) kt = 4kc . 3) you and your friend, who weighs the same as you, want to go to the top of the eiffel tower. your friend takes the elevator straight up. you decide to walk up the spiral stairway, taking longer to do so. compare the gravitational