Which structure is the site of nutrient and gas exchange between the mother and a growing fetus? A. placenta B. umbilical cord C. fallopian tube D. uterus

Longitudinal seismic waves are known as a. primary waves. b. secondary waves. c. surface waves. d. transverse waves.

Which gland or organ is not strictly classified as an endocrine gland?

Of the three mechanisms leading to autopolyploidy, which is the most rare event?

To study the details of protein molecules on the surface of a cell, a biologist would likely use a A) compound light microscope B) dissecting microscope C) Scanning electron microscope D) transmission electron microscope

In 1907, Dr. Duncan MacDougall performed a series of experiments in which he attempted to measure the weight of the soul as it left a dying person.

Which one of the following choices can be added to increase the creaminess the nutritional value of soup without adding fat

Why would an ecosystem be unable to sustain an increase in carnivores? A There is not enough prey. B The carnivores now have more space. C Plant growth increases. D It is a marine ecosystem.

What was the most important result of the meireki fire of 1567 in edo?

Scientists study the biosphere to examine the relationship between biotic and abiotic factors that impact the entire planet and the hierarchy of life.

A mangrove swamp community has the following food chain: Mangrove - mangrove tree crab - mangrove water snake - raccoon → American crocodile Which population would be most likely to increase if the American crocodile disappeared from the community?