Match the following circulatory systems with the correct animals.

1. closed circulatory system

2. two-chambered heart

3. four-chambered heart

a) fish b) earthworm c) birds

When a pendulum is held high and taut and then is released, the pendulum begins to swing. What's the correct order of the energy transformations in this example? (PE stands for potential energy.) A. gravitational PE → elastic PE → thermal energy B.

Is the cnideria composed of true tissues

Generation 1 51 49 100 Generation 2 185 95 280 Generation 3 240 80 320 Generation 4 325 75 400 Generation 5 450 30 480 Study the table above. A frog population was introduced to a new habitat.

Which of the following is characteristic of plant cells, but not animal cells? a. vacuoles c. nucleus b. mitochondria d. cell walls

How can water affect the rock cycle? Water can cause rocks to break into sediments through mechanical weathering. Water can cause rocks to be buried deep underground. Water can cause rocks to melt.

When water freezes, how does the ice compare to the liquid water? The ice has a greater mass and a greater volume than the water. The ice has the same mass but greater volume than the water. The ice has less mass and less volume than the water.

Angus is accused of having a restriction of range problem in his evaluations of coworkers. what is most likely to be true about angus?

Why might it be advantageous to use nonrenewable resources over renewable resources?

If a species can adapt to a changing environment or it's descendents will survive

Which of the following is an interaction in which one organism benefits and the other is harmed (+/-) ?