Answer:
asteroids are made of metals or rocky materials while comets are made up of ice
Explanation:
D)convergent is the answer
B. Allele is a form of gene.
Answer:
Two effects of the Silk Road are the sharing of technological advancements and the spread of the plague.
Explanation:
The Silk Road was a network of trading routes that connected East Asia, Southeast Asia, South Asia, Central Asia, the Middle East, Europe, and northwestern Africa. This trading network has been functional for several thousand years and it has had a lot of positive effects on humanity, but also the occasional negative one.
One big positive effect has been the sharing of technological advancements between the different civilizations, which has led to improvements in the living conditions, exploration, and further advancements all over the areas that are connected with this network. One big negative effect has been the plague. Through the extensive trade of goods, the plague managed to find its way from East Asia all the way to Europe, and it had such a negative effect on the population that it contributed to big geopolitical changes, and it was the last time when the human population dropped.
Answer: The Earth's crust that formed these mountains was once covered with an ocean
