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

You have a solution that contains phospholipid vesicles in a test tube. these vesicles have phospholipid bilayers, but do not contain any membrane transporters. you add a number of different molecules to the solution, and wait a period of time for them to equilibrate. if you could measure the concentration of each molecule, for which of the following would you expect to measure equal concentrations inside and outside of the vesicles? assume for this question that the overall osmolarity inside and outside the vesicles is the same (that is, there is no appreciable diffusion of water across the membrane). (select two answers) an amino acid with a hydrophobic side-chain a small non-polar molecule a negatively charged ion a small polar molecule a small lipid hormone

Which best describes carbon dioxide’s path out of the body

The most effective way to provide children with safety messages is to