Which of the following is used by arachnids to breathe?

a. book lungs
b. spiracles
c. book gills
d. tracheae


a. book lungs

Biology & Microbiology

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Free radicals can be damaging because they are _____.

a) unstable b) highly reactive c) radioactive d) both unstable and highly reactive

Biology & Microbiology

Four of the five answers listed below assist in chromosome movement. Select the exception

A) Spindle microtubules B) Centriole C) Centromere D) Kinetochores E) Nuclear envelope

Biology & Microbiology

The water from tertiary sewage treatment can be used as drinking water

Indicate whether the statement is true or false

Biology & Microbiology

What is the difference between microevolution and macroevolution?

A) Microevolution deals with microscopic organisms, whereas macroevolution deals with larger ones. B) Microevolution describes changes within a population over a short period of time, whereas macroevolution describes larger changes such as the formation of new species over longer periods of time. C) Microevolution describes what happens in small populations, whereas macroevolution deals with large populations. D) Microevolution is hypothetical because changes are too small to be observed, whereas macroevolution is detectable.

Biology & Microbiology