1 4 and 5 I think .... (insert 20 characters)
Primary producers are organisms in an ecosystem that produce biomass from inorganic compounds Hope that helped!
Around 4.1 billion years ago the first single celled organism appeared
Answer:
The three most important sources of environmental problems are 1) market failure, 2) the tragedy of the commons, and 3) the underprovisioning of public goods
Explanation:
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One grow/develop 2 reproduce 3 obtain/ use energy 4
