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:
Age Limit If you decide to fund a Traditional IRA for your spouse, he or she must be under age 70.5 for the year for which the contribution is being made. There are no age limits that apply to Roth IRA contributions.hould you decide to contribute to your spouse\'s IRA, be sure to consider deductibility, including whether either of your contributions can be deducted, and if not, whether a Roth IRA should be funded instead. In addition, be sure to consider eligibility should you decide to contribute to a Roth IRA.