The diagram below represents a cell in the human body Which statement concerning the structures within this cell is accurate?
A) Structure 1 is a chloroplast that carries out photosynthesis.
B) Structure 2 is a vacuole that contains DNA.
C) Structure 3 is a mitochondrion, where respiration takes place
D) Structure 4 is the cell membrane, which provides rigid support for the cell.

Charles darwin published his theory of evolution in 1859. in what way foes modern evolutionary theory differ from the theory as proposed by darwin? a) darwin inferred that individuals can evolve, but modern generic science has shown that this is not true. b)darwin inferred that individuals do not evolve, but modern genetic science has shown that this is not true. c)modern science has disproved most of darwin's original theory of evolution, because darwin knew nothing about generations and their role in heredity. d)generic studies have shown that gene expression and other factors operate along with natural selection, but most of darwin's theory has been supported by modern science.

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes