Read and understand the question. Choose the correct answer.

Which of the following is the main organ of the nervous system?

Nostrils are the opening into the nasal passages that are lined with hairs called cilia. Why are cilia important?

Which of the different types of nerves or neurons are responsible for carrying the impulse from the sense organs to the spinal cord or brain?

Blood is the liquid part of the circulatory system. Which is the main work of the blood?

The main function of the human heart is to pump blood throughout the body. Which of its part pumps deoxygenated blood to the heart?

What does the skin do to protect muscles and bones?

What does the skin do as the first line of defense of the body?

 Muscles give the body shape and mass. Which of the following is another function of the muscles?

Which of the following is NOT an example that shows that a message being carried by the nerve cells to the muscles?

Which activity shows how the digestive and circulatory system work together?

How are you able to classify the succeeding invertebrates: mosquito, beetle, ladybug, and flea?

Mollusks are invertebrates that occupy an oversized range of water and land community. They have bivalves or univalve shells. Which of the following is not a mollusk?

Birds have strong beak and sharp claws that can be used for hunting and eating their prey. Which group of birds can do this way in hunting their prey?

They have gills that let them breath underwater. They also have jaws, fins, and scales. Which of the following vertebrates possess these characteristics?

Reptiles have lungs that can be used for breathing on land. Which of the following vertebrates is a reptile?

Conservation of forests is forest management and protection of the forests. Why do we need to conserve our ecosystem?

Mangroves are a group of trees and shrubs that inhabit the intertidal coastal zone. Why are mangrove plants important?

What will happen in an ecosystem if we fail to protect and conserve them?

The Philippine archipelago is well known for its species-rich coral reefs, but warm waters, ocean acidification, overfishing, and physical degradation destroy these coral reefs? Which of the following practices destroys coral reefs?

What are the ways of conserving and protecting forest ecosystem?