Before there was life on earth, which gas was absent from the ancient atmosphere?

A. ammonia

B. methane

C. nitrogen

D. Oxygen

If you stained both, onion cells and cheek cells what would stain the quickest and why?

Archaea differ from bacteria in that archaea Archaea differ from bacteria in that archaea lack nuclei. are prokaryotic. use organic compounds for food. have cell walls composed of substances other than peptidoglycan. reproduce by binary fission.

In starfish, pink boy color (P) is dominant to orange (p), and thick eyebrows (T) are dominant over thin (t) ones. Patrick, who is heterozygous for body color but purebred for thick eyebrows, has met Patti, who is recessive for both traits.

2. Sound waves going under a door is an example of sound wave O diffusion O diffraction

What type of geologic faulting and folding structure is revealed by the rock layers in the road cut at the sideling hill placemark?

Which group contains more individual aliens, a phylum or a class

How do you rearrange the formula of density

One way that a pollen grain can get to the stigma of a pistil

A mineral is classified as a ore as long as?

The inflammatory response can cause A. permanent immunity. B. pain, swelling, and a local rise in temperature. C. antibodies to bind to antigens. D. cytotoxic T cells to attack infected cells.