If you found a human skeleton that you believe is approximately 20,000 years old, which radioisotope would you use to date it?

235U

238U

14C

40K

What does the body do to maintain homeostasis easy version?

When one factor affecting an organism is not within the optimal range, the range of tolerance for another factor affecting that organism may be reduced. True False

A flower is ready to become a fruit where would the instruction be found? A. Nucleus B. Plant ovum C. Mitochondria D. Ribosomes

How many main structures make up a neuron?

Which was the original source of atmospheric oxygen? Question 4 options: autotrophs cooling of Earth's crust formation of the oceans volcanoes

What is the source Code of transcription

One of the primary functions of DNA in cells is to A. Serve as a storage firm for unused nucleotides B. Occupy space in the nucleus to keep the nucleus from collapsing C. Copy itself exactly for new cells

What feature do lymphatic vessels share with veins that allows lymph to flow in only one direction?

The negative stain is used to the negative stain is used to determine cell size. visualize endospores. determine flagella arrangement. visualize the outer membrane. determine gram reaction.

The visible part of the ear has the ability to stretch significantly, and then recoil back to its original position. Which protein fiber must be present?