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:
[1] There are no official minimum or maximum age limits on making contributions to a Roth IRA. This feature gives younger and older investors the opportunity to invest the money they've earned and accrue earnings at a tax free rate.inimum Age Limits. There is no minimum age limit on when an investor may begin making contributions to a Roth IRA. As long as the trustee or custodian that holds the account will allow a minor to open a Roth IRA, a child or teenager may make contributions from post tax income.