What is the term for a group of organisms that can reproduce and have fertile offspring

How can you approximate the number of calories required to keep you in energy balance?

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

Need the diagram below, which is not drawn to scale, shows the position of the earth, moon, and sun. what type of eclipse occurs when the earth, moon, and sun are lined up in the order shown? a. planetary eclipse b. solar eclipse c. martian eclipse d. lunar eclipse