Which type of organism is made of specialized cells that work closely together to keep an organism alive? A. none of these B. multi-celled C. single-celled D. specialized

Which of the following is an advantage of solar energy?

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion