3. (2 pts.) Many animals such as worms and snails are hermaphrodites. a. Describ

Question

3. (2 pts.) Many animals such as worms and snails are hermaphrodites. a. Describe what it means to be a hermaphrodite. b. Many hermaphrodites cannot self-fertilize; they still need to encounter another individual of their species with whom they can exchange sperm. Why is self-fertilization not as common with hermaphrodites? In other words, what might be a disadvantage of self-fertilization? 4. (2 pts.) We see 3 different developmental strategies in mammals: monotremes (lay shelled eggs), marsupials (part internal and part external development), and placentals (fully internal development). Each type of development has its advantages and drawbacks. For any ONE of these (your choice), state one benefit and one drawback. 5. (1 pt) Why do animals like cnidarians, particularly corals and anemones, undergo metamorphosis, in other words, why is metamorphosis a successful strategy for th 6. 1 pt.) For animals that undergo metamorphosis, what is one risk they could potentially face? 7. (1 pt.) The germ layer that distinguishes triploblasts from diploblasts is the: ENDODERM / MESODERM / ECTODERM (circle one). What is one structure that is derived from this tissue layer? 8. (1 pt) Sea urchins are: PROTOSTOMES / DEUTEROSTOMES (circle one), which means they have , cell cleavage, cell fate and coelom nar rhythms in human performance

Explanation / Answer

3. A. Hermaphrodite have both male and female reproductive organs with in one organisms.

B.No evolution or diversify, Disease resistance is less, Become sterile

4. Placental
Advantage -Due to Longer gestation period offspring well developed. They can walk and even run within a few hours of birth.

Disadvantage - Mother has to take more nutrient to ensure the health of both the mother and fetus.

5. metamorphosis may lie in its ability to reduce competition.

6. Risk. During metamorphosis stage most individuals died because of unexpected circumstances happen in environment or other predator kill them.

7. Mesoderm - Muscle cells

8. Deuterostomes, radial holoblastic cleavage.
autonomous

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