Đang chuẩn bị liên kết để tải về tài liệu:
Darrell Gulin/Getty Images.EcologyThree generations of reticulated giraffes are interacting on an African savanna. Females start breeding at around five years old, and gestation is about 15 months. Calves are born from a standing female, dropping six f

Không đóng trình duyệt đến khi xuất hiện nút TẢI XUỐNG Tải xuống

Science is occurring all around you, and the opening photo of each chapter will preview the science you will be learning about. The Chapter Preview will give you an idea of what you will be learning about, and you can try the Launch Lab to help get your brain headed in the right direction. The Foldables exercise is a fun way to keep you organized.