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GÜNÜN PARŞÖMENİ · 4 EKİM 2026 · PALEONTOLOJİ VE EVRİMSEL ZAMANLAMA

Hayvan yaşamı fosil kayıtlarından çok daha önce başlamış olabilir

Animal Life May Have Begun Far Earlier Than Its Fossil Record

C1 · 4 dakikalık okuma · Kaynak: Yale University, 2 Ekim 2026

Metin

An international study reported by Yale suggests that animals may have originated between 800 and 700 million years ago, at least 100 million years before the oldest recognisable animal fossils. The team combined newly identified microfossils, chemical evidence and molecular-clock analysis, which estimates ancestral dates from genetic differences among living species. A central problem is that missing fossils do not necessarily prove that animals were absent. The 550-million-year-old Kheseen Biota in Mongolia contains no animal fossils even though animals are known to have existed then, weakening arguments based on a similar absence at an older Chinese site. Researchers therefore used three exceptionally preserved formations dating from roughly 850 to 730 million years ago as possible maximum ages for animal origins. Their estimate implies that animals may even have appeared before the Snowball Earth ice ages. However, the authors emphasise that further discoveries are needed to refine both the date and the nature of the earliest animal life.

Özet ve soru Prometheus’a aittir. Haberin tamamı: Yale University ↗

Beş ifade

  • fossil record: fosil kaydı
  • molecular clock: moleküler saat
  • ancestral date: atasal zaman tahmini
  • maximum age: mümkün olan en eski yaş sınırı
  • recognisable fossil: ayırt edilebilir fosil

YDS mini sorusu

Why is the Kheseen Biota important to the researchers’ argument?

  1. It supplies animal fossils for molecular clocks and places the first animals around 550 million years in the past.
  2. It provides one of the three ancient formations used to set possible maximum ages for the earliest animals.
  3. It demonstrates that a fossil site can lack animal remains even when animals are known to have existed.
  4. It links the missing fossils to animal losses during Snowball Earth and explains the gaps in both fossil records.
  5. It preserves genetic material from early animals that allows their ancestral dates to be read directly from fossils.
Cevabı ve açıklamasını göster

Doğru cevap: C

Kheseen sahasında, hayvanların o dönemde var olduğu bilindiği hâlde hayvan fosili yok. Bu durum, başka bir sahada fosil bulunmamasının hayvanların hiç var olmadığını kanıtlamayacağını gösterir; doğru cevap C’dir.

Kheseen preserves abundant microfossils but no animal remains from a time when animals certainly existed, showing why fossil absence alone is unreliable.

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