What do scientists use to study fossils? Geologists use a method called radiometric dating to determine the exact age of rocks and fossils in each layer of rock. This technique, which is possible because radioactive materials decay at a known rate, measures how much of the radioactive materials in each rock layer have broken down […]

What prevents more than one sperm from fertilizing the secondary oocyte? -The acrosomal reactions of many sperm expose the sperm membrane. -The acrosomal enzymes released from many sperm digest holes through the zona pellucida. -They block multiple sperm from entering the oocyte. Focus your attention on part (5) of Focus Figure 28.1. Why are numerous […]

What organ produces insulin glucagon and hydrolytic enzymes? pancreas In which part of digestive system does digestion start? Digestion begins in the mouth, well before food reaches the stomach. When we see, smell, taste, or even imagine a tasty meal, our salivary glands in front of the ear, under the tongue, and near the lower […]

Why does a green solution appear green? Green plants are green because they contain a pigment called chlorophyll. Chlorophyll absorbs certain wavelengths of light within the visible light spectrum. Green light is not absorbed but reflected, making the plant appear green. Chlorophyll is found in the chloroplasts of plants. Why do plants reject green light? […]

In what step do you perform the steps of your experiment? The scientific method has five basic steps, plus one feedback step: Make an observation. Ask a question. Form a hypothesis, or testable explanation. Make a prediction based on the hypothesis. Test the prediction. Iterate: use the results to make new hypotheses or predictions. In […]

What part of the amniotic egg provides food for the embryo? yolk Can you have a yolk sac and no baby? It contains a yolk sac (protruding from its lower part) but no embryo, even after scanning across all planes of the gestational sac, thus being diagnostic of an anembryonic gestation. A blighted ovum is […]

What happens during translation quizlet? What happens during translation? During translation, a ribosome uses the sequence of codons in mRNA to assemble amino acids into a polypeptide chain. The correct amino acids are brought to the ribosome by tRNA. What happens in translation simple? Translation is the process that takes the information passed from DNA […]

Does most weather occur in the troposphere? The troposphere is the lowest layer of Earth’s atmosphere. Most types of clouds are found in the troposphere, and almost all weather occurs within this layer. The troposphere is by far the wettest layer of the atmosphere; all of the layers above contain very little moisture. Why does […]

What is the meaning of 3 consecutive days? Consecutive comes from the Latin consecutus, meaning “following closely” with no gap. Just like those snowstorms — one storm happened each day, back to back, for five days in a row. Consecutive numbers also follow each other, or advance in the right order. For example, 5, 6, […]

How does salt affect bacterial growth? There are several ways in which salt and sugar inhibit microbial growth. The most notable is simple osmosis, or dehydration. Salt or sugar, whether in solid or aqueous form, attempts to reach equilibrium with the salt or sugar content of the food product with which it is in contact. […]