Which two of the following sentences from the arpicle include central ideas of the article? 1. If the transformation from chemistry to biology proves to be straightforward, the universe
might be full of life
2 These telescopes have provided beautiful images of protoplanetary disks as well as maps of
their chemical composition
3. Favored geochemical scenarios involve volcanic regions or impact craters.
4. Today, scientists are focused on understanding how chemistry on the infant Earth gave rise
to RNA and to RNA-based cells
(A)
1 and 2
1 and 4
(C)
2 and 3
(D)
3 and 4

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