Question

1. some nonnative plants can adapt to their environments more quickly than some native plants or crops can. which adaptation would least likely help a nonnative plant to survive in a new environment?

a. having a large number of seeds
b. having a resistance to herbicides
c. having roots that develop rapidly
d. having leaves that form at a slow rate

1. some scientists have suggested that pandas may be more closely related to raccoons than to bears. what could scientists compare between pandas and the raccoons to help classify the panda more accurately?

a. their diets
b. their dna
c. their body sizes
d. their geographic distribution

1. the diagram shows four animals that lived at different times. fossil evidence indicates that each animal was an ancestor of the next one on the timeline. which statement is the best conclusion that can be made about these animals over time?

a. changes to each animal
were harmful and caused
their extinction.
b. traits each animal
acquired during its
lifetime were passed onto
the next generation.
c. cold temperatures during
the ice age caused the animals to grow larger with each generation.
d. genes for beneficial traits were passed on, resulting in animals more fit
for their environment.
(diagram: four animals on a timeline labeled 50 million years ago, 45 million years ago, 40 million years ago, 37 million years ago, with each subsequent animal appearing larger.)

1. scientists believe that the polar bear in alaska and the brown bear in russia evolved from a common ancestor. which would be responsible for this evolutionary change?

a. artificial selection
b. asexual reproduction
c. sexual competition
d. geographic isolation

Explanation:

1. For question 1: Slow leaf formation limits photosynthesis, reducing energy for survival and establishment in a new environment, making it the least helpful adaptation.
2. For question 2: DNA sequencing provides the most definitive, objective evidence of evolutionary relationships between species to confirm taxonomic classification.
3. For question 3: The fossil timeline shows directional trait changes consistent with natural selection, where beneficial heritable traits are passed on to produce more fit descendants.
4. For question 4: Geographic isolation of the common bear ancestor population separated the groups, allowing them to evolve independently into polar and brown bears due to different environmental pressures.

Answer:

1. d. having leaves that form at a slow rate
2. b. their DNA
3. d. Genes for beneficial traits were passed on, resulting in animals more fit for their environment.
4. d. geographic isolation