Answer the following question given this paragraph: Pollen is a tiny male gametophyte enclosed in a tough capsule. Pollen carries sperm to an ovule while preventing the sperm from drying out. Pollen grains can't swim, but they are very light, so the wind can carry them. Therefore, they can travel through air instead of water. Q: What is the tiny male gametophyte enclosed in a tough capsule? Choices: - Cell Capsule - nitrogen - calcium - pollen A:
pollen
(Question)
Answer the following question given this paragraph: are attached to the end of each bronchiole. At the end of each duct are approximately 100 alveolar sacs, each containing 20 to 30 alveoli that are 200 to 300 microns in diameter. Gas exchange occurs only in alveoli. Alveoli are made of thin-walled parenchymal cells, typically one-cell thick, that look like tiny bubbles within the sacs. Alveoli are in direct contact with capillaries (one-cell thick) of the circulatory system. Such intimate contact ensures that oxygen will diffuse from alveoli into the blood and be distributed to the cells of the body. In addition, the carbon dioxide that was produced by cells as a waste product will diffuse from the blood into alveoli to be exhaled. The anatomical arrangement of capillaries and alveoli emphasizes the structural and functional relationship of the respiratory and circulatory systems. Because there are so many alveoli (~300 million per lung) within each alveolar sac and so many sacs at the end of each alveolar duct, the lungs have a sponge-like consistency. This organization produces a very large surface area that is available for gas exchange. The surface area of alveoli in the lungs is approximately 75 m2. This large surface area, combined with the thin-walled nature of the alveolar parenchymal cells, allows gases to easily diffuse across the cells. Q: The anatomical arrangement of capillaries and alveoli emphasizes the structural and functional relationship of what systems? Choices: - nervous and lymphatic - digestive and respiratory - endocrine and renal - respiratory and circulatory A:
(Answer)
respiratory and circulatory
Ques: Answer the following question given this paragraph: Aquatic arthropods use gills to exchange gases. These gills have a large surface area in contact with the water, so they can absorb more oxygen. Q: What do aquatic arthropods use to exchange gases? Choices: - lungs - pores - diaphragm - gills A:
Ans: gills
(Q).
Answer the following question given this paragraph: Each muscle fiber contains hundreds of organelles called myofibrils . Each myofibril is made up of two types of protein filaments: actin filaments, which are thinner, and myosin filaments, which are thicker. Actin filaments are anchored to structures called Z lines (see Figure below ). The region between two Z lines is called a sarcomere . Within a sarcomere, myosin filaments overlap the actin filaments. The myosin filaments have tiny structures called cross bridges that can attach to actin filaments. Q: Hundreds of organelles called myofibrils, made up of two types of protein filaments, are contained in each fiber of what? Choices: - bone - hair - cartilage - muscle A:
(A).
muscle
Ques:Answer the following question given this paragraph: An embryo is an organism in the earliest stages of development. Embryos of different species may look quite similar, even when the adult forms look very different. Look at the drawings of embryos in Figure below . They represent very early life stages of a chicken, turtle, pig, and human being. The embryos look so similar that it's hard to tell them apart. Such similarities provide evidence that all four types of animals are related. They help document that evolution has occurred. Q: What is defined as an organism in the earliest stages of development? Choices: - a zygote - a gamete - an nucleus - an embryo A:

Ans:an embryo
Answer the following question given this paragraph: If you are a girl and use tampons, be sure to change them every four to six hours. Leaving tampons in for too long can put you at risk of toxic shock syndrome . This is a serious condition. Signs and symptoms of toxic shock syndrome develop suddenly, and the disease can be fatal. The disease involves fever, shock, and problems with the function of several body organs. Q: Leaving tampons in for too long can put you at risk of what syndrome? Choices: - Vaginismis - Endometrial Cancer - Scalded Skin Syndrome - toxic shock A:
toxic shock