Challenge 1
Explain herbicide resistance
Describe how inherited survival advantages change the weed population over generations.
Application library0/4 attempted
B.9A·Biology·Evolution
Evolution & Natural Selection in the real world
Analyze molecular and geographical evidence of common ancestry, and explain how natural selection acts on inherited variation in populations.
Transfer evidence, not just familiar practice
Correctly solve different fresh variations at least 24 hours after your first correct transfer response. Reviewing the same challenge again does not count as fresh retention evidence.
You can explore every situation now. Practice unlocks after you retain B.8B and B.7C.
Career · Agronomy and wildlife management
Agricultural field management
An agronomist tracks herbicide resistance in weeds, while a wildlife biologist observes beak-depth differences during a prolonged drought. Both traits are heritable.
Why this TEKS matters
Natural selection changes inherited trait frequencies when some variants consistently survive and reproduce more successfully under current conditions.
Challenge 2
Predict drought adaptation
Predict the beak-depth pattern if dry seeds remain the main food source.
Everyday life · Medicine use and local ecosystems
Antibiotics and backyard wildlife
A patient stops antibiotics early, and a neighborhood survey compares the same lizard species on dark shaded rock and pale sand. Both examples involve inherited variation and survival.
Why this TEKS matters
Selection acts on existing variation in populations; an individual bacterium does not intentionally adapt, and different habitats can favor different variants.
Challenge 3
Explain surviving bacteria
Choose the statement that correctly describes what happened to an individual bacterium and the later population.
Challenge 4
Compare nearby lizard habitats
Predict color-morph frequencies over generations when survival differs and movement is low.