During a visit to a desert ecosystem, a student observes the following:
• A hawk eats a snake.
• A lizard eats a fly.
• A tortoise eats small patches of grass.
• A snake eats a mouse.
Based on student's observations of how each of these organisms
obtain's energy, which of the following statements is the best
conclusion?
A. The hawk is a primary consumer.
B. The grass and the desert tortoise are both primary
consumers.
C. The lizard is a tertiary consumer.
D. The lizard and the snake are secondary consumers