nicole5918

30.05.2020 • 

Biology

TIMED QUESTION))Study the timeline. A timeline. 4.5 billion years ago, Earth is formed. 4.3 billion years ago, Earliest water. 4.1 billion years ago, Single celled life. 3.5 billion years ago, Earliest oxygen and photosynthesis. 2.5 billion years ago, Complex single celled life. 1.5 billion years ago, Multi cellular life. 500 million years ago, Land life. 300 million years ago, Dinosaurs. 200 million years ago, Mammals. 130 million years ago, Flowers. 5 million years ago, Humans.

Which statements indicate what the fossil record suggests about evolution on Earth? Check all that apply.

Humans have only recently existed on Earth.
Organisms originally lived only in Earth’s water.
Life on Earth started when water formed on Earth.
Plants did not have flowers when dinosaurs existed.
Multicellular life evolved before complex single-celled life.

Ответ:

hunterbrod71

13.10.2020

Biology

---

Antigens are molecular structures that trigger an immune response which later results in the production of antibodies. Macromolecules that are usually the best antigens have a lot of examples, however, they have four common characteristics: foreignness, size, complexity, and degradability. The more a macromolecule has these, the better it is as an antigen. 

---

0,0(0 оценок)