How many independent variables can be tested in a controlled experiment?

A. one

B. two

C. three

D. as many as you want

The same kinds of cells that grow in similar patterns in different but related organisms produce a. homologous structures such as wings and arms. b. the same kind of embryos. natural variations in a population. d. descent with modification.

The movement of Earth's tectonic plates is related to A. cycles of sunspots. B. movements of materials in the mantle. C. phases of the Earth's Moon. D. seasonal changes in weather systems.

Which of the following is a function of the spleen? a. Cleanses the interstitial fluid b. Circulates the lymph c. Removes worn out red blood cells d. Stores platelets e. Both a and b f. Both c and d g. Both a and c h. Both b and d

In a comparison of birds and mammals, having four limbs is

Many motor and sensory functions are primarily controlled by the:

Mary has had several depressive episodes but only one manic episode. she would be diagnosed with:

Cross a pure-bred tall pea plant with a heterozygous tall pea plant. The allele for tall pea plants is dominant to the allele for short pea plants.

What are dolphins made / what support structures do they have?

The suture that forms the articulation of the parietal bones with the frontal bone is the

What are elongated landforms made of older moraines over which glaciers have moved? A. Drumlins B. Kettle Lakes C. Eskers D. Outwash Plains