Charlie hypothesizes that if he adds earthworms to a compost pile, it will decompose twice as fast as a compost pile without earthworms. which of the following steps could compromise his experiment?
start two compost piles at the same time with the same materials.
add earthworms to one compost pile.
add decomposing bacteria to the other compost pile.
rate the level of decomposition in each compost pile every week.
report his results.
a.
step 1
b.
step 4
c.
step 2
d.
step 3

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

Kudzu vines grow by climbing and wrapping around trees. trees covered by kudzu can die because they are starved of sunlight. what type of relationship exists between the trees and the kudzu growing on them?

Which state of matter has the following physical properties: ~ takes the shape of the container it is in ~ takes the volume of the container it is in ~ low density. answer is gas