From the producer level to which level does energy flow directly?

decomposer

tertiary consumer

secondary consumer

primary consumer

Although you get wet while swimming, a tough protein within the skin prevents it from soaking up moisture like a sponge. This substance is: A) carotene B) hemaglobin C) keratin D) collagen

Describe in your own words the function of the Krebs cycle.

Which structures are found in both plant cells and animal cells? Choose all answers that are correct. a. ribosome b. mitochondria c. nucleus d. cell membrane

The nitrogenous bases in DNA are held together by ... A. Covalent Bonding B. Iconic bonding C. Hydrogen bonding D. Van der Waals forces

The nervous system isn't only

What are the potential consequences if a person has their gallbladder removed?

What must change in the ecosystem for tree to appear

What name is given to the rigid structure, found outside the plasma membrane, that surrounds and supports the bacterial cell?

Select all that apply. Which of the following are methods of classical biotechnology?

An important example of a "positive feedback loop" in the polar climate system is: a. Scientists in remote places check on each others instruments. b. Warming ocean water opens new areas for marine species. c.