What created oxygen in the early atmosphere

Photosynthetic bacteria

Asteroids hitting the earth

plankton

Volcanic eruptions

forests

What happens to air when it heats up

Kelly hypothesizes that if she waters a fig tree seedling, it will grow twice as fast as an unwatered seedling. Which of the following steps would compromise her experiment? 1. Plant two fig tree seedlings of the same age 2.

All the biotic and abiotic factors in a particular area A: ecosystem B: biome C: habitat

Identify two ways in which environmental resources are important to human health. biology

Explain why biodiversity is important for the survival of species

What is the molar mass of Na2B4O7 rounded to the nearest whole number

How does the rate of extinction compare to the rate of species formation on Earth today?

The use of a radioactive substances as a therapy for in-tent restenosis of a coronary vessel is referred to as

Tongues have the ability to taste sweet, sour, salty, and bitter. true false

Two ways that bacteria cause disease are