Seeding a new tank is done by... a
adding bacteria from an established tank's filter
b
adding commercial bacteria
c
neither of the choices
d
both of the choices

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.

Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.

Which of the following is the sl unit used to measure temperature a. kilogram b. liter c. meter d. kelvin