Reptiles and birds differ from amphibians in that they lack a free larval stage. What adaptation allowed the elimination of this stage?
What will be an ideal response?
The development of an amniotic egg made the need for a free living larval form unnecessary. These egg types contain amniotic fluid, which protects developing embryos and keeps them moist. These eggs are also supplied with generous amounts of yolk for nourishing the embryos until they grow and hatch at an advanced stage.
You might also like to view...
Glucose, sucrose, and cellulose are examples of:
A) carbohydrates. B) disaccharides. C) monosaccharides. D) polysaccharides.
Children in the Southeastern United States play with red maple fruits (Acer rubrum). The fruits are tossed in the air and spin back to the ground, acting like small helicopters. Which part of the fruit allows for this?
A. The pericarp B. The integument C. The endosperm D. The ovule Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about maple fruits? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Schizophrenia, hypertension, and diabetes are ____
a. caused by a mutation to the same common allele b. believed to be diseases carried on the Y chromosome c. caused only by environmental factors d. caused by a single gene mutation e. considered to involve complex traits
Urine cannot escape back to the ureter from the bladder because there is/are blocking the way.
a. A valve b. mucosa c. Two valves d. A flap of muscle