Why are chromosomes not always visible?

a.

They are often very loosely coiled in strands of chromatin

b.

They are wound very tightly

c.

They lose pigment in sunlight

d.

They are often behind the nuclear envelope

What are recorded observations called? a. hypotheses. b. theories. c. experiments. d. data.

John Needham performed an experiment testing spontaneous generation. He boiled chicken broth, placed it in a sterile flask, and then sealed the flask. After a few days, Needham observed microorganisms in the flask.

A farmer mates a bull that is homozygous dominant for color (BB) and heterozygous curly for coat (Cc) with a cow that is homozygous white for color (bb) and homozygous for a straight coat (cc).

Lichens are found in areas A) Undergoing primary succession B) Undergoing secondary succession C) of climax communities (I don't know what this means actually.)

Which of the following activities has a negative impact on biodiversity

Why are spiders considered to be an r selected species?

What are restriction enzymes used for in nature?

Material with bits of rocks and once living parts of animals are

Think about a flower growing in your garden you notice that all of the leaves are falling off why is this a problem for the plant

How does polymerase chain reaction make DNA fingerprinting more reliable