A person walks along the trail from location C to location D. The person will be walking 1.
downhill then uphill, only
2.
downhill, then uphill, then downhill again
3.
uphill then downhill, only
4.
uphill, then downhill, then uphill again

Match the types of competition to their descriptions

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

The smallest parts of these that retain their original properties are called