How have conditions for life on Earth changed over time?

a.

separation of continents

c.

both a and b

b.

ice age

d.

neither a nor b

As a final exam question in your biology course, you are asked to identify an animal that you immediately recognize as a chordate. Your instructor applauds you for your quick recognition of the phylum, but then he asks you to be more specific.

Why does only one egg rather than four eggs develop during oogenesis given that spermatogenesis results in for sperm being formed from one stem cell?

What is a list of types of organisms in an eco pyramid?

why do so many hurricanes experienced by florida have the same locations of origin off the west coast of Africa to the Caribbean Sea

An individual with (naturally) curly hair and an individual with (naturally) straight hair mate; all of their offspring have (naturally) wavy hair.

The greenhouse effect is related to the increase in average surface temperatures known as

Which of the following is true about spring tides but is not true about neap tides? they must occur during a new moon in spring they occur during the moon's first quarter and third quarter phases they only occur during a full moon they can occur

Animal cells are bathed in an isotonic fluid, and plant and bacteria cells have a cell wall. What does this protect the cell membrane from?

Explain why latin is the basic for many scientific names

What is incomplete penetrance and what causes it? incomplete penetrance means the heterozygote has an intermediate phenotype between the two homozygous phenotypes because of interactions with environmental factors.