The Revenue Reconciliation Act of 1993 modified the 1986 passive loss restrictions by allowing individuals who materially participate in rental real estate to deduct rental losses from other income. To qualify, how much time must a person devote to personal services to real property trades or business during a tax year

The answer is "50%"

Explanation:

Modify the state budget Act of 1974 to boost the FY in 1994 and 1995. It is the maximum federal debt quantity and also to set these other quantities for FY 1996 to 1998. Repudiates in the 1994 and 1995 boundaries on consumption spending.

In the Act of 1993, it modifies the 1986 active losses restrictions so, that it allowed rental damages from other revenues to also be deducted from persons who significantly participated such rental properties.  

The person may allocate 50% to his time towards services rendered throughout a tax year from the business.

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'