GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - R5K17I2C75TX1SB5J

The passage suggests that biologists who say egg production in birds is biologically highly costly would agree that clutch size is determined primarily by A. the nutritional and energy demands of egg production B. the number of young that the parents can rear successfully C. reproductive limitations operating during chick rearing D. the availability of food for newly hatched chicks E. the differences between altricial and precocial species