Q: What is the product of microfilament movement powered by chemical energy? Read this paragraph and choose the correct option from the provided answers: Choices: - blood circulation - nerve stimulation - muscle fusion - muscle contraction A:
muscle contraction

(Question)
Q: Changing electric and mnagnetic fields radiate outward when? Read this paragraph and choose the correct option from the provided answers: When charged particles accelerate , changing electric and magnetic fields radiate outward. The traveling electric and magnetic fields of an accelerating (often oscillating) charged particle are known as electromagnetic radiation or light. Choices: - particles lose their charge - particles multiply - firing particles accelerate - charged particles accelerate A:
(Answer)
charged particles accelerate

Ques: Q: What are embedded in the membranes of b cells and bind a variety of antigens through their variable regions? Read this paragraph and choose the correct option from the provided answers: Figure 42.13 B cell receptors are embedded in the membranes of B cells and bind a variety of antigens through their variable regions. The signal transduction region transfers the signal into the cell. Choices: - b.a.p cell receptors - a.m. cell receptors - er cell receptors - b cell receptors A:
Ans: b cell receptors

(Q).
Q: What scientific word, which gives its name to a type of rock, means "to change form"? Read this paragraph and choose the correct option from the provided answers: Metamorphism. This long word means "to change form. " A rock undergoes metamorphism if it is exposed to extreme heat and pressure within the crust. With metamorphism , the rock does not melt all the way. The rock changes due to heat and pressure. A metamorphic rock may have a new mineral composition and/or texture. Choices: - evaporation - evolution - igneous - metamorphism A:
(A).
metamorphism

Ques:Q: What causes reduction of elasticity in all organs? Read this paragraph and choose the correct option from the provided answers: Unlike bones and tendons, which need to be strong as well as elastic, the arteries and lungs need to be very stretchable. The elastic properties of the arteries are essential for blood flow. The pressure in the arteries increases and arterial walls stretch when the blood is pumped out of the heart. When the aortic valve shuts, the pressure in the arteries drops and the arterial walls relax to maintain the blood flow. When you feel your pulse, you are feeling exactly thisthe elastic behavior of the arteries as the blood gushes through with each pump of the heart. If the arteries were rigid, you would not feel a pulse. The heart is also an organ with special elastic properties. The lungs expand with muscular effort when we breathe in but relax freely and elastically when we breathe out. Our skins are particularly elastic, especially for the young. A young person can go from 100 kg to 60 kg with no visible sag in their skins. The elasticity of all organs reduces with age. Gradual physiological aging through reduction in elasticity starts in the early 20s. Choices: - low vitamin D - radiation - weight gain - age A:

Ans:age

Ques:Q: The diversity of life on earth today is the result of what? Read this paragraph and choose the correct option from the provided answers: The diversity of life on Earth today is the result of evolution. Life began on Earth at least 3.5 to 4 billion years ago, and it has been evolving ever since. At first, all living things on Earth were simple, single-celled organisms. Much later, the first multicellular organisms evolved, and after that, Earth's biodiversity greatly increased. Figure below shows a timeline of the history of life on Earth. You can also find an interactive timeline of the history of life at the link below. http://www. johnkyrk. com/evolution. html. Choices: - spontaneous mutation - generation - mass extinction - evolution A:

Ans:
evolution