Students working on plant extracts want to test the hypothesis.
extracts of bougainvillea flowers are effective in reducing symptoms of acne in teenage girls.
the students are denied permission to conduct such an experiment for ethical reasons. what is the most likely reason for being denied permission?

Fill in the blank 1. digestion occurs in the small intestine through the action of enzymes. 2. urea, excess water, and other waste materials are eliminated in a water fluid called 3. can cause infections by injecting dna or rna into hosts. 4. the human immune system produces in response to a vaccine, which later can bind to and destroy a pathogen if it invades. 5. are structures that link bone to bone at a joint 6. in the heart, blood flows from the right atrium to the right ventricle, where it is pumped to the the words i can use are: lymphocytes gliding pivot gas urine absorption dermis fulcrum lungs chemical viruses capillary vertebrae esophagus tendons antibodies synapses ligaments kidneys pathogens

Compare the parts of a cell and the cell as a whole to another common nonliving system (i.e., a car, a city, describe the parts of a cell and their primary function.

This diagram shows how seed plants are grouped. which is the missing label? bryophytes angiosperms pteridophytes monocots