population can be refered to as a group of organisms of the same species living in the same geographic area at the same time.
population growth
(births - deaths) + (immigration - emigration)
what factors limit population growth?
food scarcity, competition for sunlight, diseases or parasites, immigration, less space (not enough land), predation, territory, natural disasters, competition for water, less reproduction grounds
intraspecific competition, name two examples
Panthera leo (male lion) competes for dominance and access to resources influencing their breeding success and overall population density. Virus arctos horribilis (grizzly bear): the predation exerted by bears plays a key role
define the tool Quadrat sampling
a quadrat is a square frame of known size that is used to sample a population of sessile (non-moving) animals or plants.
when is quadrant sampling used
to see if there is a relationship between a specific abiotic factor (soil pH, amount of sunlights, temperature etc) and the distribution of plant species
evidence for endosymbiosis
eukaryotic mitochondria and chloroplasts have their own circular DNA
