Which of the following are characteristic of american agriculture?
a.
high productivity on limited cultivable land
b.
a large percentage of the population engage in agriculture
c.
high levels of productivity and mechanization
d.
low levels of land per farmer and productivity per hectare

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

Which image shows labeled organelles that are present only in plant cells?

Which part of cellular respiration must occur before any of the other steps can occur