In a genotype for plant height, such as Tt, what

does each letter represent?

A. one genome

b. one gene

c. one allele d. one gamete

How did the discovery of ribozymes assist in creating a plausible model for the prebiotic origin of life?

The wood thrush is a bird species that lives in deciduous forests in North America. Wood thrushes nest in tall trees, forage for insects and snails in decaying leaf litter on the forest floor, and drink water from nearby freshwater sources.

What causes a cell to divide? What are the things on the outside that send signals?

Match each feature to its description

Blood vessels that carry blood away from the heart are called

Which of the following statements correctly relates mutations and survival rates of animals? Mutations always improve the chances of survival for an animal. Mutations sometimes improve the chances of survival for an animal.

Which derived character is shared by fish and frogs but not lancelets? A. hair B. four-legged locomotion C. amniotic eggs D. vertebral column

In what regions of the world is habitat loss most rapid?

Describe the process of speciation in relation to change in gene frequency, change in environment, natural selection, and genetic drift.

Which substance acts as a buffer in natural water? A) minerals and salt B) distilled water C) sulfuric acid D) a pH indicator