can you help me answering all of these questions?

how old is earth

this allele has no noticeable effect on an organisms phenotype

When homologous chromosomes crossover, what occurs? - Maternal alleles are "corrected" to be like paternal alleles and vice versa. - Two sister chromatids exchange identical pieces of DNA. - Each of the four DNA strands of a tetrad is broken and the pieces are mixed. -...

Hi, Could yasmin tabs be used for postitercoarse contraceception, eg 2 tabs q 12 hrs for two days?

A hypothetical "microbullet" shot into a cell through the phospholipid bilayer will pass the bi-layer parts in which order

Compare the pig brain to drawings of a human brain, a fish brain, and a bird brain. Can you see how the pig anatomy parallels human anatomy? What can you conclude about our relation to animals like pigs? Like birds? Like fish? I have not been able to find anything on birds brain or fish brain.

if photosynthesis is the process that "deposits" energy in a "saving account" then what is cellular respiration

how does a heart attack affect routine observations

Can't this question go to someone else. You already told me you didn't know the answer.