One of the conditions required to maintain genetic equilibrium is?

A. natural selections

B. Mutations

C. Nonrandom mating

D. no immigration or emigration

You discover a new type of marine organism that has the kidneys of a fish but no gills. what effect would the absence of gills have on excretion of nitrogenous waste? no effect. nitrogenous wastes diffuse across the skin. no effect.

It is what a manufacturer spends for goods or services. a) cost b) price c) markup

Scientists counted all the different types of trees in Osborne Forest in 1950 and then again in 2000. The scientists saw that Osborne Forest did not change very much during the 50 years. What did change in Osborne Forest? A.

Bryophytes are known as non-vascular plants. What makes them non-vascular? Absence of xylem and phloem Inactive xylem and phloem Active xylem but inactive phloem

Use the diagram of Earth to match each letter to its description. A. The equator B. A woman walks in a straight line with the sun to her right at nine o'clock in the morning. Toward which pole does she walk? C.

The front leg of an iguana and the wing of a bird look different, but both limbs likely originated from a similar limb in a shared ancestor. Structures such as these are said to be A) heterogeneous B) differentiated C) vestigial D) homologous

What's the genotype of human female

Fluid filled sacs found between the skin and underlying bony prominences are called

Trees, such as those in the deciduous forest, are very important to the environment. If the number of trees on earth continues to decrease significantly, what might be the result?

List two reasons why amphibians must live in moist environment.