Help this test is timed What is a system?
2 points
The solid rock part of Earth, including mountains, valleys, continents, and all of the rock beneath the oceans
The set of all water on the earth's surface, such as lakes, seas, and oceans
A group of related parts that all work together to perform a specific function
The greenhouse gases that help keep the earth at a temperature where water is in liquid form

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?

Darrel conducted an experiment with the following procedure: fill two cups with ice water. place an uninflated balloon snuggly onto your left index finger. blow a little air into an identical balloon, and place it onto your right index finger. place both fingers into the cups of ice water. darrel noticed that his right finger felt warmer in the ice water than did his left finger. which of the following does the experiment show? a. air is a good radiator of heat. b. air is a good insulator of heat. c. air is a good conductor of heat. d. air is a good convector of heat.

Advances in technology have enabled scientists and researchers to better study the evolutionary relationships between species