The skin of a human develops from an embryonic layer known as the

A) endoderm

B) mesoderm

C) meristem

D) ectoderm

What regulates the temperatures on Earth and protects it from harmful UV rays and meteors? A. Earths magnetic field B. Earths atmosphere C. Earths moon D. Earths ocean's

Developing nations currently produce about how many kcal of food per person per day

Which one of the following criteria is necessary for natural selection to occur? A. Individuals show no variation in fitness levels. B. Individuals have the same adaptations. C. Enough resources exist for individuals to survive and thrive. D.

3. Paul's travels between the United States and Africa have been shocking because of the unexpected contrasts and similarities between the continents that he's witnessed.

Glucagon: a. functions like epinephrine in the liver and like insulin in muscle. b. functions like insulin in the liver and like epinephrine in muscle. c.

Jessi consumes a diet of 1920 total kcalories that has 80 g of fat. what percent of jessi's diet comes from fat? (give answer to the appropriate reporting digit. only give the value. do not include the term percent or its abbreviation.)

Scientists break down evolution into catogories

The process of sediments being compacted and cemented to form sedimentary rocks is called A. metamorphism. B. deposition C. crystallization D. lithification

What is presumptive identification of a microorganism?

Which statement best describes the climate of a city? Select one: The average annual temperature of Austin, TX is 68.5°E San Antonio, Texas had a high temperature of 102°F today. Dallas, Texas had 8.6 centimeters of rain today.