The cordilleran flycatcher and pacific-slope flycatcher were once thought to be the same species, but they are now known to be different species because they have different common names they don't look the same they have different diets they do not interbreed

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

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)