Phytoplankton are essential because they produce which of the following?

A. oxygen

B. nitrogen

C. sulfur

D. phosphorus

What are the main functions of the integumentary system?

In a eukaryotic cell, the DNA is enclosed in the nucleus, whereas the ribosomes that make proteins are located in the cytoplasm.

Almost all animals share the following characteristics except A. cell walls. B. diploidy. C. heterotrophy. D. mobility.

The stage of meiosis in which chromosomes pair and cross over is: a. prophase i b. metaphase i c. prophase ii d. metaphase ii e. anaphase ii

Taste buds Select one: a. can perceive seven basic tastes. b. are replaced approximately every 30 days. c. can only perceive taste if the molecules are in solution. d. can be found covering both the superior and inferior surfaces of the tongue. e.

What does action force mean

Which cell organelle synthesizes phospholipids and steroids

Margot is pregnant with her first child, and she is deliriously happy! She and her husband have some tests taken, but before the doctor can come in and review the results, Jim sneaks a peek at the file with the test results.

How do cancer grows and spreads

Which statement best illustrates the concept of the interrelationship of living things with the physical environment, as found in the definition of ecology? A) Hawks and eagles often compete with each other. B) White-tailed deer shed their antlers.