If plants produce oxygen as a result of photosynthesis why aren't oxygen levels continually increasing the atmosphere

Which of the following is not a type of system? Biomedical Ecological Social Biological (not sure if this is physics but it doesn't give me the option to pick science for subject)

Suppose you saw a waxing gibbous moon. What phase would you expect one week later?

What will most people think when you say no with confidence in situations where other people are smoking? a) You are sticking with your decision. b) You are being influenced by advertisements. c) You are being pressured by peers. d) You are boring

A scientist discovers a new planet. She notices that the planet has alternating bands in the atmosphere that all flow in the same direction. What can she assume about the planet?

An object with a positive electric charge will be attracted to what? * A. Any object no matter what its electric charge. B. An object with no electric charge. C. An object with a negative electric charge. D.

Describe the factors that form deep currents

A comet is cruising through the solar system at a speed of 50000 kilometers per hour for 4 hours time. What is the total distance traveled by the comet during this time in kilometers, miles, and light years?

A gas in a closed container is heated with 12J of energy, causing the lid of the container to rise 3m with 5N of force. What is the total change in energy?

What are illuminated objects?

During one year a population of blue jays has zero population growth. which must be true about the blue jay population at the end of the year compared to the beginning of the year?