How are chordates further divided into three subphyla? A. By their habitats
B. By the presence or absence of a notochord
C. By how they obtain food
D. By their body structures

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.

Consider the equation s + o2 ? so2. what is the product? question 3 options: s so 2 s + so 2 o 2

What is the difference between a meteoroid and a meteor?