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:
401k Annual Contribution Limit. The annual contribution limit for 401(k) plans is by far the easiest to understand. There are only two categories: whether or not you are 50 years old or not. If you are under age 50 you can contribute $17,500.or the average American the Roth IRA is a great choice as far as retirement accounts go. For that average American the contribution limit is $5,500 per year, plus $1,000 in catch up contributions if you're over age 50.