Please Help With my Biology?
Nonvascular plants lack _____, specialized cells that help support the plant as well as transport water and nutrients upward from their roots.
Flowering plants became important parts of the world's terrestrial ecosystems during the:
The largest mass extinction of the Paleozoic Era was:
at the end of the Cretaceous Period
at the end of the Permian Period
at the middle of the Jurassic Period
extinctions never happened.
Ichthyosaurs went extinct at the end of the:
Sauropod dinosaurs included all of these except:
Autotrophic organisms obtain their food:
from another creature
by chemical synthesis
b or c
Bacteria lack which of these structures?
both a and b
Which of these is a type of prokaryotic cell?
a and b
Birds first appeared and rose to prominence during the:
Which of these was NOT a period of the Mesozoic?
The first mammals evolved during the _____ Period.
The mammal trait of having fur is an example of a derived character because this trait
is shared by all mammals and also is present in a common ancestor
is an example of slow change over time
is found among mammals but not in the common ancestor of mammals
is shared among all vertebrates
Linnaeus' smallest category in his classification system was the:
Animal cells lack:
Which of these is NOT characteristic of chordates?
a dorsal supporting rod
a dorsal hollow nerve cord
chloroplasts in their cells
Vascular plants have _____, specialized cells that transport food such as dissolved sugars.
The _____ generation of a tulip is the dominant phase of its life cycle.
When we see a mushroom for sale at the store, we are seeing the _____ of the fungus.
asexual reproductive structure
sexual reproductive structure
Entamoeba hystolitica is a protist that causes which of these diseases?
Auxins regulate or influence which of the following?
all of these
_____ are bacteria that grow in association with a root and “fix” atmospheric nitrogen.
Which of these is a part of a flower?
all of these are flower parts
Which of these is NOT an organ of a plant?
Which of these cell types lines body surfaces?
Hormones act on organs and tissues in which of these body systems?
all of these
Cardiac muscle fibers function to:
support the body
make bones move
release heat to maintain body temperature
contract the heart
An axon conducts nerve impulses _____ the cell body.
both toward and away from
The _____ are the female sex hormones.
The exchange of oxygen and carbon dioxide between blood capillaries and body cells is governed by:
The urinary system consists of all of these EXCEPT:
produced by the B cells