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. The contribution amount limits to a Roth IRA are the same as those to a traditional IRA. However, your eligibility to contribute to a Roth IRA depends on your income. You can make a full contribution to each Roth IRA as long as your working spouse makes less than $173,000 in 2012.raditional IRA. The maximum IRA contribution limit is $5,000 for those under the age of 50. For those 50 and older, the contribution limit is $6,000. This contribution limit applies to all IRAs held in each personâs name.