what kind of exoskeleton do arthropods have

a hardened external skeleton

what must arthropods do to grow

she their exoskeleton

how do you spot an arthropod?

segmented body plan, jointed appendages, eyes are compound, and a exoskeleton.

what percent of species are arthropods

70%

arthropods make up what percent of total animal biomass?

42%

what is the major importance of arthropods.

pollination, nutrient cycling, players of decomposition, food source, disease causers and disease spreaders, agricultural, and sources of medicine and engineering inspiration.

what is population?

individuals of a single species living in an area. sharing allele pool.

what is fitness in animals?

how good a particular genotype is at leaving offspring in the next generation.

________ evolve when _________ with different genotypes survive or reproduce at different rates.

populations; individuals.

what is sexual selection

selection for traits that increase on individual’s reproductive success.

what is required for evolution

genetic variation, generational time, change in genetic frequencies.

what is the source of genetic variation

mutation

what is the constraints of evolution?

trade-offs - if your big and strong, you probably won’t be very smart.

scientific names are…..

they are universal, same in every country and every language

what is a common name?

regular names arthropods are called like the bee.

how does a phylogenetic tree work?

lineage splits, new traits volves, and trait is carried forward into future splits.

what does a phylogenetic tree represent?

an actual history of evolutionary lineages that have branched over time.

what are the subphyla of arthropods?

myrlapods, trilobites, chelicerates, crustaceans, and insects.

what are the eras of the arthropods?

the phanerozoic eon, which seperates into the paleozoic, mesozoic, and the cenozoic eras.

what caused explosion of diversity and speciation in the Cambrian period?

the hox gene, transition to land, and oxygen levels rise in atmosphere.

how do we know about evolutionary history?

fossils

how do fossils form?

buried in sediment before decomposition occurs.