How many chromosomes does a human zygote have?

The chart matches messenger RNA codons with amino acids. A DNA strand has the codon AAT. What amino acid would it be that corresponds the messenger RNA code?

Homeostasis refers to A. The similarity of genetic traits to one another B. A mixture or solution that is the same thoughout C. The effect of natural selection on human evolution D. The tendency of a cell to maintain a stable internal environment

About how many brain connections will be present on average for a 3 year old

Struggle of several organisms for the same resource called

Which of the following protists have shells?

A species has homologous chromosomes. what does this say about the species?

Which has the greatest effect on the amount of salt in a salt marsh? These are the choices

The reproductive process that creates genetic variety in a population is

Which statement best describes an ecosystem maintaining a state of approximate equilibrium? (1) Nutrients from decayed organisms are recycled in a forest ecosystem. (2) All the frog species in a South American rain forest become extinct.

Which of these shows the correct pathway through the heart's four chambers after it enters from the vena cava? a. left ventricle - -> right atrium - -> left ventricle - -> left atrium b.