The correct answer is (b.) species. Species is a basic unit of macroevolution. Macroevolution focuses more on the changes that occurred in species, it refers to a smaller evolutionary change within a particular species or population.
Robert Hooke discovered Nucleus in the cell !!
So, C is the most appropriate answer !! as nucleus contains genetic material and is passed to daughter cells !!
This is associative learning.
The reactions of George and Ken are based on when they are startled. George will learn to associate his sister's crying with him being startled because it happens every time his sister cries.
Whereas Ken will not know when his sister will cry or when he will be startled by the crying so this has no affect on Ken.
Hence, crying will affect George but not Ken.
For the first one, electrons travel around the nucleus in fixed energy levels with varying energies.
Second one, protons, neutrons, and electrons have a mass, but electrons have far less mass
Third one, cations and protons
Fourth, not sure.
The correct answer is D: catalytic converter. A catalytic converter is a device which reduces the effects of exhaust emissions. The catalytic converter converts toxic gasses in the released smoke or exhaust into less toxic pollutants using a catalyzing redox reaction. Catalytic converters have commonly been used in internal combustion engines and <span>furnaces</span>.