The ultimate source of energy (for most ecosystems) is the sun. The ultimate fate of energy in ecosystems is for it to be lost as heat. Energy and nutrients are passed from organism to organism through the food chain as one organism eats another. Decomposers remove the last energy from the remains of organisms.
The Contribution Limit. For 2013 and 2014. the basic limit for regular contributions to a Roth IRA is $5,500 for people under 50 years of age, and $6,500 for those who are 50 or older. (Numbers like this can be found in our Reference Room.) This limit may be reduced for any of the following reasons:
Roth IRA Contribution Limits for Individuals Under 50. Individuals who are under 50 years old may contribute $5,500 to an IRA. This amount is the maximum you may deposit per year across all IRAs you may have with multiple providers, including both Traditional or Roth IRAs. For example, you could contribute $2,500 to a Roth IRA with one provider and $3,000 with a second provider. You cannot contribute $5,500 to the first Roth IRA and $5,500 to the second provider. Your total contribution limit is $5,500 for all accounts for the tax year.