Biology

A student has two solid blocks that have different masses. The student knows that each block is composed of a pure substance, but she wants to know if the blocks are composed of the same pure substance. Which of these would best show that the blocks are composed of different substances? A. Both blocks sink when placed in water. B. Both blocks can be scratched by a piece of glass. C. One block conducts electricity and the other does not. D. One block has a greater volume than the other block.
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From new moon phase to full moon phase, what do you see?1. a decreasing amount of the lighted side of the Moon2. the same amount of the lighted side of the Moon3. an increasing amount of the lighted side of the MoonI need an answer ASAP!! I will give you a brainliest!!
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Which of the following best describes an antigen?
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Which are two molecular groups that distinguish proteins from carbohydrates?
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HELPPPPP!!!!!The following are true of DDAVP or desmopressin except D. it helps to stimulate the urinary bladder to produce more urine.C. it is administered by injectionA. it is a form of vasopressinB. it is used to take the place of ADH
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PLZ HELP BRO its about environmental systems
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The purpose of the light-dependent reactions of photosynthesis is to - asplit water to form oxygen bproduce sugars cjoin glucose molecules to form starch duses energy molecules like ATP
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The body has a number of systems that protect against infection.Which of the following correctly orders four of these systems from most to least foundational?Choose 1 answer: A. B cell lymphatic tissue, lymph node, lymphatic systemB. B cell, lymphatic tissue, lymphatic system, lymph nodeC. lymphatic tissue, B cell, lymph node, lymphatic system
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The organelles that break down lipids, carbohydrates, and proteins intosmall molecules that can be used by the cell are called *A. vacuolesB. lysosomesC. ribosomesD. microfilaments
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How do limiting factors influence each other?
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explain the interaction between geological events, human population, and the environment
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I NEED HELP ASAP. Ice cream atomic theory write a summary about the topic. added scientific information definite/indefinite shape & definite/indefinite volume for solids, liquids, AND gases. PLZZZZ HELP ME
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when did large mouth bass arrive in nebraska
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what is the natural rate of nitrogen fixation in earths ecosystems?
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Explain what is wrong with the cells shown in the image below.
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What type of plate boundary is in the image below?DivergentConvergentTranform
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We need to recycle our waste because Earth is a closed system with respect tomatter, and new matter does not enter the environment. Agree or disagree
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Multiple choice please help!
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As a commodity producer, the price that you receive is likely to be different than the price your neighbor receives for selling the same commodity.TrueFalsePLEASE HELP ME PLEASE
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During the 1918 influenza pandemic, the world was still engaged in World War I. Movement and mobilization of troops placed large numbers of people in close contact, and living spaces were overcrowded. How could modern epidemiology have assisted with the detection and prevention of this communicable disease? Vaccines could have been given to all military personnel. Cities could have implemented community mitigation measures. Social distancing could have been enforced in military living spaces. Records of troop movement could have been used for contact tracing.
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Megan observes four cells under a microscope and makes sketches of them as shown. Identify whether the cells are prokaryotic or eukaryotic.
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Find three consecutive odd numbers whose sum is 117. Find two ways to do this.
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What happens when the third phosphate group is removed from an ATP molecule?
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Pls help with this biology question
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