A book rests on a table. The force of gravity pulls down on the book with a force of 25 Newtons. What prevents the book from accelerating downward at 9.8 m/s??
A
The table presses back up on the book with an equal and opposite reaction force of 25 N.
B
The table and book together are both accelerating down at 9.8 m/s.
The inertia of the book holds it up.
С
D
The table presses back up on the book with a force greater than 25 N.
10.)

Photosynthesis uses co2 and cellular respiration produces co2. we call the point when the two processes are in balance--when there is no net production of co2--the compensation point. how might you limit one of the processes in order to achieve a compensation point?

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?