Which kinds of lenses are in a light microscope? a concave objective lens and a

1.The correct answer is: convex objective and eyepiece lenses

The compound light microscope has two systems of lenses with the role to magnify:

•the ocular, or eyepiece lens. It is the part at the top of the microscope and it is in direct contact with microscopist. These lenses are the one that the microscopist look through and their magnification is 10x or 15x  

•the objective lens. The objective lens is a convex lens of short focal length with magnification 4×, 10x, 40x, 100×.

Total magnification of microscope is the product of both, the ocular and the objective magnification. For example, 10x ocular and 4x objective gives the 40x magnification to the microscope.

2.The correct answer is: It has allowed for faster transmission of Internet signals.

The primary function of the fiber-optic cables is to carry signals at high speeds and they do it by sending pulses of light through an optical fiber. The light produces an electromagnetic carrier wave that can carry information, so it is used to transmit telephone signals, Internet communication, and cable television signals.

1) Crossing over

2) Independent assortment.

Explanation:

Gametes are formed resulting from the process of meiosis where the gametes get half of the original number of chromosomes. One phenomenon that happens during the prophase 1 of Meiosis and leads to the genetic diversification is crossing over. In this process , Here, homologous chromosomes pair up and exchange information present on genes from one another. When information is exchanged, it leads to the diversity of genetic data.

The second way of increasing genetic diversity is independent assortment that takes place during metaphase 1. In this process chromosomes from both father and mother cells align on equatorial plate of the cell in an independent manner. This means that some gamete can have 1 of many different chromosomal combinations.

This reshuffling of chromosomes during independent assortment enhances the genetic diversity of any organism and this also explains why kids of same parents can look or behave very different.

Hope it help!