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What term describes materials, such as food scraps and paper, that can be naturally broken down by microorganisms over time?
ANon-biodegradable materials
BSynthetic materials only
CRadioactive materials
DBiodegradable materials
What is a primary function of the vertebral column, or spine, in the human body?
AFiltering the blood
BProducing red blood cells exclusively
CProducing insulin
DProtecting the spinal cord while providing structural support for the body
What term describes single-celled, microscopic organisms, some of which, like the parasite that causes malaria, can cause disease in humans?
AViruses
BAlgae only
CProtozoa
DFungi
What term describes the time it takes for half of a given sample of a radioactive substance to decay?
AFission point
BIsotope period
CDecay rate
DHalf-life
What term describes a species whose population has declined so significantly that it faces a high risk of becoming extinct?
AKeystone species only
BInvasive species
CDomesticated species
DEndangered species
What is the function of the epiglottis, a small flap of tissue located at the top of the windpipe?
AIt closes over the windpipe during swallowing to prevent food from entering the airway
BIt regulates heart rate
CIt filters air entering the lungs
DIt produces digestive enzymes
What is a defining structural feature of a virus that distinguishes it from a typical living cell, such as a bacterium?
AA virus consists of genetic material enclosed in a protein coat, without the full cellular structure of a living cell
BA virus is always significantly larger than a bacterial cell
CA virus can only survive at extremely high temperatures
DA virus always contains chlorophyll for photosynthesis
Which naturally occurring radioactive element is most commonly used as fuel in nuclear power plants?
AGold
BSilver
CAluminum
DUranium
What term describes the complete disappearance of a species, meaning no living members of that species remain anywhere on Earth?
AHibernation
BDomestication
CMigration
DExtinction
What is the primary role of the diaphragm, a dome-shaped muscle located beneath the lungs?
APumping blood throughout the body
BFiltering toxins from the blood
CProducing hormones for digestion
DContracting and relaxing to facilitate breathing