Human beings as we know them have existed for about __years.

A. 65 million

O

O

B. 10,000

O

C. 250 million

O

D. 200,000

Scientists conduct experiments to collect evidence. Which of the following is the best definition of the word experiment as used by scientists? A. the formation of a hypothesis B. making a series of observations C.

Slightly acidic rainwater can contribute to which process

A sexually reproducing animal has two unlinked genes, one for head shape (h and one for tail length (t. its genotype is hhtt. which of the following genotypes is possible in a gamete from this organism?

Which hormone signals ovulation? FSH LH inhibin estrogen

Which of the following is NOT a major urine formation process? glomerular filtrationtubular reabsorptiontubular secretionmicturition

According to the endosymbiosis theory scientist believe early eukaryotes form from prokaryotes why do scientist believe that prokaryotes existed earlier eukaryotes

Areas of land covered with water for at least part of the year are called

What is the correct sequence for the events of mitosis, meiosis, fertilization, and birth in sexual reproduction?

What must be presented in orders for cloud to form

When so few members of a species reamin that it can no longer play its role in the biological communities where it is found, the species has undergone?