Final answer:
Ticks are consumer organisms that survive by feeding on the blood of their hosts.
Step-by-step explanation:
The correct statement is b) A tick that survives on cattle can do. Ticks are ectoparasites that survive by feeding on the blood of their hosts, such as cattle. This makes them consumers, as they obtain energy by consuming other organisms. The other options are not true: a) A pitcher plant is a primary producer, as it is capable of photosynthesis and produces its own food; c) Oxygen is considered a greenhouse gas as it contributes to the greenhouse effect; d) Enhanced greenhouse clean does not exist and therefore cannot help maintain Earth's balance.