Vertebrates digest food in digestive tracts. Cnidarians accomplish the same function using

A. Specialized teeth

B. Crops and digestive enzymes. C. Gizzards.

D. Gastrovascular cavity's

Biogeography is the study of a where species and their ancestors live. b how extinct species can be related to living species. c how different species can interbreed. d how animals that live in the same area are closely related.

Which is used to make many copies of DNA? A. PCR B. Reverse transcriptase C. Gel electrophoresis D. Nuclear tranfer

Which of the following is evidence for the endosymbiosis theory

How many sperm are produced with every heartbeat?

Jeremy loses his former interest in doing arithmetic after his teacher promises him $1 for each problem he solves correctly. Which theory best explains Jeremy's loss of interest in arithmetic? a. self-monitoring theory b. self-perception theory c.

How are stock speculators different from stock investors?

A condition called an aneurysm occurs when a

Which one of the following molecules is a by-product of cellular respiration? a. Glucose b. Oxygen c. Pyruvate d. Water

What substances, present in fruits and vegetables, provide significant health benefits such as reducing the risk of cancer?

Which structures are common to both prokaryotic and eukaryotic cells? check all that apply. vacuole cell membrane golgi body ribosome cytoplasm endoplasmic reticulum?