Which observation could lead to the conclusion that an object is nonliving?*

Decomposers are necessary in a food chain because they*

In early spring, many wildflowers begin to grow, produce flowers, and release seeds. The leaves of the wildflowers make food before the leaves of the trees in the area begin to develop. The early growth pattern of the wildflowers would likely result in*

Which sequence best represents increasing complexity?*

The diagram below represents two processes that occur in organisms. A characteristic represented by X is common to both of these processes.

A characteristic that the two processes have in common is that each process*

The molecules represented in the diagram below can interact to cause a biochemical process to occur.

Molecule A and molecule B most likely represent*

The cytoplasm in a single-celled organism and the circulatory system in a human both*

A hydrangea plant has blue flowers when grown in acidic soil, but has pink flowers when grown in basic soil. A clone of the pink-flowered plant is grown in acidic soil and produces blue flowers. This change in flower color is most likely due to*

The diagram below represents a microscopic structure observed during mitosis.

The region indicated by letter A is known as*

A significant difference between the effects of the genetic information passed on from asexually reproducing parents to their offspring and sexually reproducing parents to their offspring is the*

A normal sequence of DNA bases in a single human skin cell is CATGGC. If this sequence replicates in this cell and becomes GATGGC, this alteration will most likely be passed to*

Beta cells in the pancreas and human skin cells both contain the insulin gene. The beta cells can make insulin; however, skin cells cannot. Which process is responsible for this gene being expressed in one cell type and not in another cell type?*

Information in segments of human DNA can be expressed by a bacterial cell as a result of*

The photograph below shows a recently discovered all-black penguin chick and several typical black- and-white chicks.

The appearance of this penguin chick with all black feathers might*

Natural selection and its evolutionary consequences provide a scientific explanation for*