What is the purpose of staining biological samples? a) Ensuring the light can pass through the sample
b) Adding contrast and labeling specific structures
c) Facilitating sectioning of the sample
d) Enabling sample collection

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u.s. and mexico. the st. lawrence seaway provides an important trading route for the u.s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

Biomass can be used to generate electricity. biomass relies heavily on agricultural crops. plants release carbon dioxide and water in combustion. plants use photosynthesis to originally generate the energy that is needed. the chemical energy of these plants all started with what energy source?

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.