The part of an ecosystem where a species lives is their

population
resource
habitat
evolution

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

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that