What important event in animal evolution marks the beginning of the Cambrian period?

the ability to swim

the ability to fly

the appearance of hard parts

the appearance of fossils

A line graph is the best way to represent the data in the table. What information belongs on the x-axis? salt concentration outside paramecium contractions per minute

Why are you asked to gram stain a mixture of gram positive and gram negative bacteria on the same slide?

Which level in the structure of proteins does the sequence of amino acids fall into? tertiary quaternary secondary primary

Which phenomena release co2 into the atmosphere

Dna replication: a. occurs by the addition of nucleotides to the end of the dna molecule. b. results in the formation of four new dna strands. c. produces two daughter dna molecules that are complementary to each other. d.

Which scientist came up with the theory of evolution

Water has a higher specific heat index than other common materials, so it takes a lot of energy to raise the temperature of water. How would this affect climate? A) Areas surrounded by water would have more snow.

Is pH=2 an acid, a base, or neutral

After one species disappears, the other species in the ecosystem

The level of which hormone increases after ovulation