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:
The Traditional and Roth IRA contribution limits are $5,500 for those under age 50. Persons age 50 and over can make additional catch up contributions of $1,000, for a total contribution limit of $6,500. You can have both a Roth IRA and a Traditional IRA in the same tax year, but you canât exceed the contribution limit with your combined contributions to both accounts.