unit 1
what is a microscope used for
to view very small objects
what are cell walls
a protective structure found outside the cell membrane of some types of organisms (specifically plants and bacteria)
what is the shape of a DNA molecule
swirly staircase
what is a fossil
mineral replacements, preserved remains, or traces of organisms that lived in the pas
what are behavioral adaptations
behaviors or activities performed by an organism that increase its fitness
what is a quantitive observation
a quantity related to what is being observed
what is the function of cytoplasm
helping the cell keep its shape
what are genes made of
DNA
when was the first life on earth estimated to be
3.8 billion years ago
what are innate behaviors
an activity or behavior that occurs naturally in an organism
what is the order of operations
observation, inference, experiment, analyze, communicate
do animal cells have cell walls
no
how many chromosomes do most humans have
46 or 23 pairs
what was the first mass extinction caused by
Photosynthetic prokaryotes caused oxygen levels to rise. This killed almost all of the non-photosynthetic prokaryotes.
what is a learned behavior
an activity or behavior that is acquired by an organism through experience