Which organism appeared on Earth first?

gastropods

horn corals

brachiopods

crinoids

Which does describes emerging scientific ideas

Identify some abiotic characteristics of the taiga biome

What is the spinal cord? a. an endocrine gland in the brain b. a lobe in the cerebral cortex c. a thick bundle of nerves d. an area embedded deep in the brain

Why Is there hair around my anus?

For the catabolite repression control system, what would be the effect on the phenotype of the lac operon of a regulator protein (CAP) that could no longer bind cyclic AMP? It would make the lac operon: a. uninducible b. constitutive c.

What is alwasy true about a binary bond

Which of these examples demonstrates metabolism? A. A person eats a large dinner for digestion and energy. B. A human's skin has the ability to tan in the sun. C. A person puts on socks because his feet are cold. D.

What structure in the fetal heart allows for mixing of blood between the two atria?

Which of the following is a constructive process? deposition detachment transport plucking

Coal deposits were formed from? A. Plant life in ancient B. Ancient plankton and marine life C. Freshwater organisms from the last 100,000 years D. Modern plants and animals