Which of these is an abiotic factor of an aquarium ecosystem?

a.
algae growing on the glass

b.
gravel on the bottom of the aquarium

c.
plants growing from the gravel

d.
fish swimming in the water

When water freezes, it . contracts expands

State officials are considering constructing a road through a forested wilderness area. this action will likely affect the forest ecosystem in various ways. part a: predict how the construction of a road could negatively affect plants and animals in that ecosystem. (3 points) part b: describe one way that the construction of a road could have a positive impact of the forest ecosystem. (1 point)

Which of the following statements is accurate about evolution? question 10 options: natural selection only eliminates odd individuals. evolution means that a population never has changes in its genetic frequencies. mutations are always harmful. evolution means that a population undergoes changes in its gene frequencies over time.