Number D.six is the answer.
Answer:
External factors include physical and chemical signals. Growth factors are proteins that stimulate cell division. – Most mammal cells form a single layer in a culture dish and stop dividing once they touch other cells. Two of the most important internal factors are kinases and cyclins.
A major drawback of using sustainable agricultural practices to produce crops is scarcity of land for agriculture.
<h3>What is a drawback of sustainable agricultural practices?</h3>
Sustainable agricultural practices are those agricultural practices that ensure the safety of the natural environment. They are those agricultural practices that do not have negative impacts on the environment.
A major drawback of using sustainable agricultural practices to produce crops is scarcity of land for agriculture which leads to unsustainable practices such as continuous cropping.
Learn more about sustainable agricultural practices:brainly.com/question/1315410
Answer:
It is A
Explanation:
The geocentric model could not fully explain these changes in the appearance of the inferior planets (those between Earth and the sun). Furthermore, Galileo's observations of Jupiter's moons made it clear that celestial bodies do move about centers other than Earth
