The amount of energy entering a food chain depends on the
(a) direction of energy flow in the system
(b) efficiency of energy recycling in the system
(c) biomass of carnivores and their efficiency in locating and capturing animal prey
(d) biomass of heterotrophs and their efficiency in transforming plant tissue into animal tissue
(e) biomass of autotrophs and their efficiency in transforming solar energy into chemical energy

Ahypothesis that has been tested again and again , with similar results each time may become a law , true or false

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.

Which type of transport is responsible for oxygen entering into blood cells? a. vesicle b. passive c. facilitated d. active b. passive