are present at low concentrations in the blood but are needed at high concentrations by a variety of cells in your body. What type of transport is used to concentrate Ca2 in the cells that need it

Acommon kind of mechanical weathering is called

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.

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