A radioactive element is an element which is subject to spontaneous degeneration of its nucleus followed by the emission of alpha, beta and gamma particles. All elements with atomic numbers greater than 83 are radioactive.
The given phrases that describe radioactive elements are-
They have a consistent number of particles
- the particles are alpha, beta and gamma particles.
They have a half-life that determines their rate of decay.
Explanation for other options:
Not all elements occur in nature. Radioactive decay rates may not be constant as the decay happens when a radioactive substance emits a particle. It is not possible to predict exactly when a given atom of a substance will emit a particular particle. When the radioactive element release energy and particles, it decays.
Answer:
Scientists are studying a group of ant colonies in the Arizona desert. Which question about the ants can be answered scientifically?
Explanation:
The correct answer will be option- Does the amount of sunlight in a day affect how much food the ants eat that day.
Explanation:
A scientific method is a systematic approach to understand and explain any natural phenomenon in nature. The scientific method involves making, ask a scientific question, do background research and propose a hypothesis which could be tested to produce a real answer to the scientific questions.
In the given question, the scientist wants to study the ants in the desert through scientific method. The possible question that could be answered will be the how the amount of light can affect the quantity of food consumed by ants as the amount of food can be studied through the experiments by proposing a hypothesis.
Thus, the selected option is the correct answer.
The pulmonary circulation conveys blood that is low in oxygen to the lungs before returning back to the left side of the heart.
<h3>The pulmonary circulation</h3>
The circulatory system is divided into two main parts namely:
- pulmonary circulation and
The pulmonary circulation involves the movement of blood between the lungs and the heart.
Blood from the systemic circulation returns to the right side of the heart where it is pumped through the pulmonary artery into the lungs to be oxygenated.
After oxygenation has taken place in the lungs, the blood returns to the left side of the heart through the pulmonary veins.
Learn more about systemic circulation here:
brainly.com/question/811428
