19. which of these layers would best be considered a volcanic intrusion when determining its age? a) layer 1…

19. which of these layers would best be considered a volcanic intrusion when determining its age? a) layer 1 b) layer 4 c) layer 7 d) layer 8 20. orb weaving spiders are considered secondary consumers in the north american prairie. which organism from the australian outback would be the equivalent of the orb weaving spider? a) mitchell grass b) moth caterpillar c) assassin bug d) white - tailed dunnart

19. which of these layers would best be considered a volcanic intrusion when determining its age? a) layer 1 b) layer 4 c) layer 7 d) layer 8 20. orb weaving spiders are considered secondary consumers in the north american prairie. which organism from the australian outback would be the equivalent of the orb weaving spider? a) mitchell grass b) moth caterpillar c) assassin bug d) white - tailed dunnart

Answer

Brief Explanations:

  1. Volcanic intrusions cut across pre - existing rock layers. Layer 8 appears to cut across other layers, indicating it is a volcanic intrusion.
  2. Orb - weaving spiders are secondary consumers. Assassin bugs are also secondary consumers in the Australian outback food chain. Mitchell grass is a producer, moth caterpillar is a primary consumer, and white - tailed dunnart is a tertiary consumer.

Answer:

  1. d) Layer 8
  2. c) assassin bug