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:
No contributions allowed after age 70-1/2. None. Annual Earned Income Requirements. Total traditional IRA contribution amount for both spouses cannot exceed total amount of your joint taxable income, or double the annual IRA limit, whichever is less.bility to deduct contributions to a traditional IRA may be limited or entirely eliminated if the working spouse contributes to an employer-sponsored plan. No effect on eligibility for spousal Roth IRA. Age Limits on Contributions Yes. Contributions are not permitted for a nonworking spouse beyond age 70 1/2.