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:
IRA contribution limits unchanged. The IRA contribution limit will remain $5,500 in 2015. Investors age 50 and older can contribute an additional $1,000 to an IRA, an amount that is not eligible for an annual cost-of-living adjustment.Bigger IRA income limits.RA contribution limits unchanged. The IRA contribution limit will remain $5,500 in 2015. Investors age 50 and older can contribute an additional $1,000 to an IRA, an amount that is not eligible for an annual cost-of-living adjustment.