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:
Contribution limits. The IRA limit for contributions in 2014 is $5,500 -- plus an extra $1,000 catch-up contribution for those age 50 or older. Note that Roth IRA contributions must be made with earned money.There's no minimum age for opening a Roth, but it must be funded with earned income.he IRA limit for contributions in 2014 is $5,500 -- plus an extra $1,000 catch-up contribution for those age 50 or older. Note that Roth IRA contributions must be made with earned money.