True.
Tertiary sources compile and summarize secondary sources. Examples: reference publications such as encyclopedias, bibliographies, or handbooks
Hi , science can answer any questions that it can study and measure. Science can answer empirical questions about the natural world.
Answer:
The beating or fanning movements of three pairs of maxilliped flagella in crabs and crayfish modify exhalent gill currents while drawing water over chemoreceptors on the head. They play an integral part both in signalling by distributing urine odours, and in active chemosensation.
Explanation: