How many protons are present in the nuclei of the three known isotopes of hydrogen?

Valerie creates a model using three different rocks. The rocks are classified as igneous, metamorphic, and sedimentary. Which property does Valerie use for classification purposes? color formation shape texture

How can scientists determine that two animal populations are truly different species?

Which of the following adaptations of tundra plants does not specifically aid in surviving the cold? A) shallow roots B) dense hairs C) retention of dead leaves D) low to the ground

How are deoxyribonucleotides made?

Veronica dives into a swimming pool on a chilly winter day. initially, she feels very cold and begins to shiver. however, after a while, veronica stops shivering as her body begins to use energy to maintain its normal temperature.

Which selection is a characteristic of both living and non-living things? A) They both use and obtain energy. B) The same atoms and subatomic particles can be found in both. C) They are both made of cells. D) They both have a metabolism.

A moss-covered log is overturned by a hungry bear looking for insects to eat. The bear disturbs an ant colony, and some chipmunks leave the hollow log to search for another home in the forest.

1. What is the word for a type of communication that goes from cell to cell 2. What is the word that means "within the cell," such as referring to signals moving from one place to another within the cell? 3.

How is the earth like a closed system? A. Matter but not energy moves through the system B. Matter does not move in and out of the system but energy does C. Matter and energy does not move through a system D.

You might infer from packages of commercial fertilizer that which nutrients are most limiting to plant growth? a. hydrogen, phosphorus, and magnesium b. carbon, nitrogen, and phosphorous c. phosphorus, potassium, and calcium d.