Which is a factor in how a species can change over time?

A.

mutations

B.

cytokinesis

C.

extinction

D.

formation of spindles

Oxygen has an electronegativity of 3.4, and rubidium has an electronegativity of 0.8. Electrons will be? between oxygen and rubidium. Shared Transfered Combined Created

What cells are made from already existing cells

Organic compounds are made up of all except which of the following elements

The data above represent the results of three different crosses involving the inheritance of a gene that determines whether a certain organism is blue or white. Which of the following best explains the mechanism of inheritance of the gene

The transfer of energy from one organism to the next in an ecosystem begins with a producer. A producer is an organism that produces its own food.

Suppose you use a microscope to look at a cell from the leaf of a tree. What structure will you see that would not be found in a cell from your fingernail? A. mitochondria B. cilia C. cell wall D. ribosomes

Name the three energy roles that organisms fill in an ecosystem.

Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine. Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine. True False

Which of the following are examples of the first specialized tissues?

Which structure of the trachea prevents it from collapsing inward and obstructing the air passageway?