What does recessive mean when referring to genes? Is it the lower case letter?

yes

Explanation:

when referring to genes, recessive is the lowercase letter. dominant is the capital letter.

yes

Explanation:

The recessive gene is considered the weak gene or the trait that you will not very commonly have.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.