Factors that a scientist chooses to keep constant over the course of the experiment are called?

During swallowing, A) The tongue flattens to the bottom of the mouth. B) Smooth muscle in the esophagus contracts slightly. C) Salivary secretions stop. the hard palate rises to close the nasal passages. D) the epiglottis bends to close the trachea.

What does the diagram show

Which statement best explains how tectonic activity affects long-term climate change

Think about how your body responds when you ingest a huge amount of sugar. Is your body's response an example of positive or negative feedback? Explain your reasoning.

The offspring of two heterozygous gray-bodied, normal-winged flies should be 50% gray-bodied/normal wings (BbRr) and 50% black-bodied/vestigial wings (bbrr) because these alleles are linked.

Which of the following statements describes a proton of an atom? A has a negative charge and is located in the nucleus. B has no charge and is located in the nucleus C has a positive charge and is located in outer energy levels.

What are reasons scientists use models? To study objects far away To study objects too large To study objects too small. To study objects easily found in a lab. To study events that take place over long periods of time.

1. true false Carbon atoms form the building blocks of most living things.

Inhibiting enzymes involved in cell wall synthesis leads to which of the following? A) cell death by osmotic lysisB) a reduction in protein synthesisC) the incomplete synthesis of the bacterial cell wallD) a reduction in the amount of usable energy

In the 20th century where did the most ecologically destructive oil spill in the US