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:
Maximum Contribution. You may contribute up to $5,500 to your IRA for 2013. If you are at least age 50 by the end of the year to which the contribution applies, you may contribute an additional $1,000. This additional amount is referred to as a catch-up contribution.here is no age limit for Roth IRA contributions. Contribution Deadline. Tax-filing extensions do not apply to your IRA contributions. This means that your contributions must be deposited by your tax filing due date, which is usually April 15.