Explanation

Vitamin A deficiency can cause a range of health problems, including:

• Night blindness (difficulty seeing in low light)
• Xerophthalmia (dry eyes)
• Keratomalacia (softening of the cornea)
• Immune system weakness
• Increased risk of infections

Explanation

Digoxin is the most readily absorbed oral cardiac glycoside.

It has a high oral bioavailability

Making it effective when administered orally for the treatment of various cardiac conditions.

Explanation

The function to give a message to effectors is b. Negative feedback. 

Negative feedback: In a negative feedback loop, a sensor detects a change in a controlled variable (like temperature) and sends a signal to a control center (like the hypothalamus).

The control center then sends a signal to an effector (like a sweat gland or muscle) to bring the variable back to its set point. Essentially, the effector's response is opposite to the initial change. 

Explanation

The right ventricle is responsible for pumping deoxygenated blood to the lungs.

While the right atrium receives blood from the vena cava, it only needs to passively push that blood into the right ventricle.

The right ventricle, however, needs to generate significant force to propel the blood through the pulmonary artery to the lungs.

This requires a thicker, more muscular wall. 

Explanation

Gastrin is a digestive hormone secreted by G-cells in the pyloric region of the stomach.

It stimulates the secretion of gastric acid (HCl), aiding in the digestion of food.

Explanation

Plants, algae, and some bacteria use photosynthesis to convert simple inorganic molecules like carbon dioxide (CO2) and water (H2O) into glucose (a type of sugar) and oxygen (O2).

This process is essential for life on Earth, as it provides energy and organic compounds for food chains.

Explanation

Chromatids are the two genetically identical copies of a chromosome that are joined at the centromere.

They are made up of chromatin and contain the same genetic information.

During cell division, the chromatids separate, and each becomes a separate chromosome.

Explanation

Diffusion is a passive process, meaning it does not require energy input.

In diffusion, particles move from an area of higher concentration to an area of lower concentration until they are evenly distributed, without the use of energy.

Explanation

The final step of the scientific method is developing a conclusion.

It involves summarizing the findings, interpreting the data, and determining whether the hypothesis was supported or rejected.

The scientific method steps in order:

• Observation
• Hypothesis
• Prediction
• Research
• Experimentation
• Data Analysis
• Conclusion

Explanation

Inheritance refers to the transmission of traits or characteristics from parents to offspring through the passing down of genetic information.

It's the process by which genetic traits are inherited.