What instrument developed in the 1600’s led to the discovery of additional objects other than the five planets, Mercury, Venus, Mars, Jupiter and Saturn, which visible to the naked eye?

Telescope also known as "spyglass"

Explanation:

In 1609, using this early version of the telescope, Galileo became the first person to record observations of the sky made with the help of a telescope. He soon made his first astronomical discovery.

hi~~

i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)