lec 1 biological diversity Flashcards
what is a cell?
basic unit of life
tiny, self-contained units, make up all living organisms
Population
group of interacting individuals of a single species located within a particular area
Divergent evolution
one species, or closely related species, acquire enough variations in their traits, leads to two distinct new species
what is the concept of homeostasis
maintaining internal conditions
all losses for cell MUST = all gains
Community
association of populations of different species that live in the same area
what are convergent characteristics?
shared features NOT from common ancestor
What are Angiosperms? What do they do?
first flowers (defining feature)
flower used for pollination (sexual reproduction)
Species
group of interbreeding organisms, produce fertile offspring
What is Systematics?
science of naming+classifying organisms and determining their relationships
What are Gymnosperms? What do they do?
first plants to evolve seeds
seeds incase plant embryos+provide nutrients
what are the shared characteristics of life?
6 pts
living organisms…
-composed of cells
-reproduce using DNA
-take energy from environment
-adapt to environment
-maintain internal conditions
-evolve as groups
How do plants gain energy? Animals?
plants: energy from sun for photosynthesis
animals: consuming organisms
what is evolution?
change in characteristics of species over time
what is the concept of energy flow? How does energy flow on earth? What is an important producer?
energy created by producers + used by consumers
sun–> producers –> consumers
Plants
How is an evolutionary tree organized?
descendants at tips of branches, traced back to common ancestor