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

Achild throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. the ball leaves her hand 1.00 m above the ground. how long is the ball in flight before it hits the ground?

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?

There are weak or strong attractive forces between atoms of liquids with a high viscosity