Question

% of energy used efficiently
organism a: 24%
organism b: 57%

1. based on the table above, which organism is the least efficient with their energy? how do you know?

lesson 9: animal nutrition lab

write a cer to answer the driving question. use both images!! digestive tract on next page! use both images!! driving question: what type of eater would the organism to the right be?

claim:
this organism is a ______ (herbivore, carnivore, cam...)

Explanation:

Question 4:

Step1: Understand energy efficiency

Energy efficiency in organisms relates to how much ingested energy is used (vs. lost as heat/waste). Lower percentage means less efficient energy use.

Step2: Compare the two organisms

Organism A has 24% energy used efficiently, Organism B has 57%. Since 24% < 57%, Organism A uses energy less efficiently.

Claim: This organism is a carnivore.
Evidence: The skull has sharp, pointed teeth (canines) and shearing teeth (carnassials), typical of carnivores that tear/fragment meat.
Reasoning: Carnivores need sharp teeth to capture, kill, and consume prey. Herbivores have flat molars for grinding plants; omnivores have a mix. The tooth structure here matches carnivorous adaptations.

Answer:

Organism A is the least efficient with energy. We know this because it has a lower percentage (\(24\%\)) of energy used efficiently compared to Organism B (\(57\%\)).

Driving Question (CER for the skull image):