During which period did humans first appear on Earth?
Quaternary
Neogene
Paleogene
Cenozoic
5 answers
Humans first appeared on Earth during the Quaternary period.
Where do scientists find pollen grains to study ancient climate change?
What attribute of the pollen grains helps scientists identify the types of plants they belonged to?
What attribute of the pollen grains helps scientists identify the types of plants they belonged to?
Scientists find pollen grains to study ancient climate change in sediment cores obtained from lakes, bogs, and other bodies of water. These sediment cores contain layers of accumulated pollen, providing a record of plant species present in the past.
The attribute of the pollen grains that helps scientists identify the types of plants they belonged to is their morphology or shape. Each plant species produces pollen with distinct morphological characteristics, such as size, shape, and surface features. These features can be observed under a microscope and compared to existing reference collections of known plant species to determine which plants the pollen grains originated from.
The attribute of the pollen grains that helps scientists identify the types of plants they belonged to is their morphology or shape. Each plant species produces pollen with distinct morphological characteristics, such as size, shape, and surface features. These features can be observed under a microscope and compared to existing reference collections of known plant species to determine which plants the pollen grains originated from.
Which of these are causes of long-term climate change? Check all that apply.
Earth's orbit around the Sun
fossils
movement of continents
solar energy
volcanic activity
Earth's orbit around the Sun
fossils
movement of continents
solar energy
volcanic activity
The causes of long-term climate change include:
- Earth's orbit around the Sun
- Movement of continents
- Solar energy
- Volcanic activity
- Earth's orbit around the Sun
- Movement of continents
- Solar energy
- Volcanic activity