The wild hog is an invasive species in the United States. They are omnivores and their population has been growing at an alarming rate. The following table shows a comparison of plots of land that were fenced and unfenced from wild hogs. Fenced Unfenced
Plant
Populations
High abundance of
large-seeded species
High growth rate
of young trees
Large population of
one invasive species
Low species diversity
Ground
Cover
Extensive flowering herbs
Plenty of plant debris
High soil nitrogen levels
Extensive bare ground

How does the lack of fencing in an area allow wild hogs to affect an ecosystem?
A.
Wild hogs bring new plants that improve the habitat and create an ecosystem that supports more species.
B.
Wild hogs cause damage to the ecosystem and native populations by destroying and eating plants.
C.
Wild hogs improve the growth of all plants because they cause the soil in the ecosystem to become more fertile.
D.
Wild hogs have a neutral impact on the ecosystem by having both positive and negative effects on populations.

The tasmanian devil, a marsupial carnivore, is facing extinction due to devil facial tumor disease (dftd) which causes bulging cancerous lumps and lesions to erupt around the face and neck — often causing enough deformation to make seeing or eating difficult. dftd has evolved into a contagious cancer, a trait that is unique among cancers. devil mating behavior involves biting around the head and neck, allowing cells from one individual — especially cells from the crumbly dftd tumors — to be transferred to the wounds or face of a new individual. this marsupial was once found across australia, but sea levels rose, isolating the tasmanian population, while the australian population went extinct. what would be an outcome of genetic isolation that is likely to have impacted the spread of dftd? a) reduced territory puts diseased individuals in greater contact with non-diseased ones. b) inbreeding results in less variation in facial features so the cancer is generally fatal. c) genetic isolation has made it difficult for scientists to develop a vaccine against dftd. d) the lack of genetic variation in the immune system of tasmanian devils minimizes resistance to the disease.

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.

Areal dna molecule consists of thousands of these pairs of nucleotides. what is the pairing arrangement of the nitrogen bases