Which phylum of the animal kingdom includes all organisms which possess a spine (backbone) ? chordata arthropoda annelida mollusca

This is a star less than mass of the main sequence star that has exhausted all of its nuclear fuel and has collapsed to a very small size.

A college student takes a standardized test and scores a 163. if the mean is 155 and the standard deviation is 7, what is the student's percentile rank? (assume a normal distribution.)

Amoxicillin is very effective for treating infections with Gram positive bacteria, and rarely causes side effects in humans. This is an example of: A) altruism. B) narrow spectrum of action. C) a broad-spectrum antimicrobial. D) selective toxicity.

The dna of a certain organism has guanine as 30% of its bases. what percentage of its bases would be adenine?

Which best describes primary succession? the quick introduction of a species to an area where none exist the quick introduction of a species to an area where organisms already exist the gradual introduction of a species to an area where none exist

How are club fungi classified

Make a concept map/organizer to relate the actions of the nervous, skeletal, and muscular systems to a stimulus.

If the temperature increases and the barometric pressure falls, then what is likely occurring? A. Cold, moist air mass is approaching as a cold front. B. Warm, moist air mass is approaching as a warm front. C.

What is 23x9 (54-9) x-273≈9273√³

What are three heat sources for metamorphism?