What is the untimate source of energy for the biosphere and what has to happen in order for living things to use it?

Lillian wonders how fast a train can move around a particular curve before it falls off of the track. Which of the following is the best way for Lillian to figure this out? A.

What is the measurement of a triangle?

What kind of behavior consists of complex interactions within groups and is seen in humans as well as ants and bees?

Which event is the most likely cause for the four periods when punctuated equilibrium seems to have occurred

What happens to Dna during sexual reproduction

What happens to enzymes when you boil them?

How is each sense organ able to transmit a nerve impulse?

Which of the following occurs when organisms interact with other living things and their environment

Why do clouds tend to form around 3:00 P. M. and 6:00 A. M.?

How does darwin's theory of evolution by natural selection explain why some organisms become extinct?