1. Decrease in bone density and strength is called osteoporosis.

2. Osteoporosis is a condition in which bones become weak and brittle.

3. Women suffer from osteoporosis more often than men.

1. Plants in the Thallophyta group are commonly called algae.

2. Thallophyta group includes such plants which are produced without embryo.

3. This group includes algae and fungi. Other plants are included in Embryophyta.

4. Pteridophyta includes plants with vascular tissue.

1. The credit for developing the cholera vaccine in 1885 goes to Spanish-French bacteriologist and hygienist Jaime Ferrán.

2. He tested a live attenuated bacterial vaccine during a cholera epidemic in Valencia.

3. Jaime Ferrán's vaccine successfully protected people from cholera and began to be used in vaccination programs around the world.

1. There are three types of blood cells made by the bone marrow: red blood cells, white blood cells, and platelets.

2. Red blood cells carry oxygen and carbon dioxide around the body. White blood cells fight infection. Platelets help form blood clots.

3. Bone marrow is a tissue located in the hollow interior of long bones.