Pencil lead is dull and brittle. That's why it breaks off when you drage it across paper. Therefore, pencil lead is made out of an element that is a?

- non-metal

- metal

- metalloids

- metalloid

What type of bond holds atoms together in a water molecule? covalent bond ionic bond hydrogen bond nuclear bond

Why don't populations of organisms that reproduce asexually have the same genetic variation as populations that reproduce sexually? Asexual reproduction uses mitosis but not meiosis. Organisms reproducing asexually only undergo meiosis.

Which condition is necessary for a mold fossil to form? The fossil must be preserved in amber. Minerals must replace the remains. The mold must be filled with sediment. Hard parts of the organism must dissolve.

Which would be a consequence of the removal of predators from a population such as the trinidadian guppy population? see concept 52.

What transport process accounts for the absorption of water?

Definition: this is a haploid cell with half the reproductive information from the parent.

Does a cell use energy when molecules diffuse in or out of the cell? Why?

Below is a list of possible challenges. Check all errors that you mentioned in your answer. Traits other than beak type might affect natural selection. It could take many generations to observe adaptions to a population.

A farmer dug a well but did not find any water Which reasons most likely explain why the farmer did not find water? Check all that apply.

A certain metabolic pathway can be diagrammed as, where a, b, c, d are the intermediates, and x, y, z are the enzymes that catalyze the reactions